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Tethering via WiFi - Troubleshooting

FYI,
I've been able to successfully use iptables to configure ip masquerading (NAT). With it, I am tethered over WiFi without using tetherbot (which still works as a backup). Hopefully someone else can package this to be more useful.
Update: See posts #13 and #15 on how to use Ad-hoc mode.
Root required
Existing wifi network required (and configured)
1> Disable WiFi through the UI. Then turn on Wifi manually using the following commands as root. Normally the phone data interface and WiFi can't be turned on at the same time. (Can this be done through the android gui somehow?)
insmod /system/lib/modules/wlan.ko
wlan_loader -f /system/etc/wifi/Fw1251r1c.bin -e /proc/calibration -i /system/etc/wifi/tiwlan.ini
cd /data/local/tmp
wpa_supplicant -f -Dtiwlan0 -itiwlan0 -c/data/misc/wifi/wpa_supplicant.conf &
sleep 5
ifconfig tiwlan0 192.168.2.30 netmask 255.255.255.0
ifconfig tiwlan0 up
Click to expand...
Click to collapse
Note that I had to use a static ip since dhcp will typically add in a gateway.
2> Enable and configure ip forwarding
iptables -I FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -I FORWARD -s 192.168.2.0/24 -j ACCEPT
iptables -P FORWARD DROP
iptables -t nat -I POSTROUTING -s 192.168.2.0/24 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
Click to expand...
Click to collapse
3> On your computers, set your default gateway to your phone's WiFi IP address (192.168.2.30 - in my case). Also set your DNS to a real DNS server.
Attached is the iptables binary, compiled with the android sdk.

just curious as to why you would want the "tethering" this way. isnt it most likely that any wifi your phone can connect to your computer most probably can too? just curious?

hondamx525 said:
just curious as to why you would want the "tethering" this way. isnt it most likely that any wifi your phone can connect to your computer most probably can too? just curious?
Click to expand...
Click to collapse
This is just progress on tethering. The proxy method is a horrible way of tethering. iptables is the correct way if done correctly. His developments while useless to most are still good because it is progressive. And he can get hotspots now LOL

hondamx525 said:
just curious as to why you would want the "tethering" this way. isnt it most likely that any wifi your phone can connect to your computer most probably can too? just curious?
Click to expand...
Click to collapse
The above configuration uses your existing wifi settings (I haven't tried ad-hoc mode).
USB networking would be better, or even bluetooth. But I'm not sure this is possible.

divinehawk, do you really need an access point? have you tried this using an ad-hoc network? (I am not sure if the G1's WiFi supports ad-hoc networks)

scootley said:
divinehawk, do you really need an access point? have you tried this using an ad-hoc network? (I am not sure if the G1's WiFi supports ad-hoc networks)
Click to expand...
Click to collapse
Doesn't look like the gui will let you do ad-hoc. Maybe if a modified wpa_supplicant.conf. I'll report back if I have success.
Ideal mode would be for the phone to *act* as an access point. But that usually requires driver support.

divinehawk said:
USB networking would be better, or even bluetooth. But I'm not sure this is possible.
Click to expand...
Click to collapse
Code:
# adb --help
[...]
adb forward <local> <remote> - forward socket connections
forward specs are one of:
tcp:<port>
[...]
...but I guess everybody already knew that. I suppose that doing it via iptables under this approach, you are still limited to specific ports.

alansj said:
Code:
# adb --help
[...]
adb forward <local> <remote> - forward socket connections
forward specs are one of:
tcp:<port>
[...]
Click to expand...
Click to collapse
that only works if you want to make a proxy... I think he is trying to make it a true internet sharing app similar to that of the wing and other WM devices

How about something similar to PdaNet?
http://www.theiphoneblog.com/2008/10/16/how-to-tether-with-pdanet/
It's interesting that it works by having you set up an ad-hoc wireless network from your computer and then connecting to that from the iPhone. Maybe that's essentially what scootley was suggesting above.
PdaNet .deb here:
http://apt.modmyi.com/2debs/pdanet1.40.deb

alansj said:
How about something similar to PdaNet?
http://www.theiphoneblog.com/2008/10/16/how-to-tether-with-pdanet/
It's interesting that it works by having you set up an ad-hoc wireless network from your computer and then connecting to that from the iPhone. Maybe that's essentially what scootley was suggesting above.
PdaNet .deb here:
http://apt.modmyi.com/2debs/pdanet1.40.deb
Click to expand...
Click to collapse
That would be awesome... I hope someone can do that soon. I am dying to be able to connect it to my computer.

A True NAT Router will be WOW with UPNP Support

I just managed to get an ad-hoc connection going between my phone and laptop, and NAT running on it. The steps are pretty much the same as in the first post of this thread, but in addition I made some changes to /system/etc/wifi/tiwlan.ini (make sure to keep a backup of the original).
First, make sure wifi is disabled on the phone gui.
Next, Set up the ad-hoc network on the laptop. I called mine "newtest". Change the properties for the connection to assign a static ip. I used 192.168.2.2. Set gateway to 192.168.2.1, and set dns to a public server - i used 4.2.2.1.
In tiwlan.ini, look for "WiFiAdhoc = 0". Change it to the following (set ssid to whatever you use):
WiFiAdhoc = 1
dot11DesiredSSID = newtest
dot11DesiredBSSType = 0
Click to expand...
Click to collapse
After updating tiwlan.ini, enable wifi manually:
insmod /system/lib/modules/wlan.ko
wlan_loader -f /system/etc/wifi/Fw1251r1c.bin -e /proc/calibration -i /system/etc/wifi/tiwlan.ini
ifconfig tiwlan0 192.168.2.1 netmask 255.255.255.0
ifconfig tiwlan0 up
Click to expand...
Click to collapse
At this point, the phone should connect to the ad-hoc network.
Now, from the OP's post, the iptables rules:
iptables -I FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -I FORWARD -s 192.168.2.0/24 -j ACCEPT
iptables -P FORWARD DROP
iptables -t nat -I POSTROUTING -s 192.168.2.0/24 -j MASQUERADE
echo 1 > /proc/sys/net/ipv4/ip_forward
Click to expand...
Click to collapse
If all went well, you now have internet access.

@rale00
Thanks a lot
i have Stock RC30 can i do this ?

Thanks rale00,
rale00 said:
I just managed to get an ad-hoc connection going between my phone and laptop, and NAT running on it. The steps are pretty much the same as in the first post of this thread, but in addition I made some changes to /system/etc/wifi/tiwlan.ini (make sure to keep a backup of the original).
Click to expand...
Click to collapse
You can also copy tiwlan.ini to somewhere else, such as /data/local, make changes, then just specify the new file when you run wlan_loader.
wlan_loader -f /system/etc/wifi/Fw1251r1c.bin -e /proc/calibration -i /data/local/wifi/tiwlan.ini
Click to expand...
Click to collapse
Also note that without running wpa_supplicant, you are going unencrypted. Using a custom wpa_supplicant.conf might work (unverified at the moment, can you try?):
My adhoc_wpa.conf
ctrl_interface=tiwlan0
update_config=1
# IBSS/ad-hoc network with WPA-None/TKIP.
network={
ssid="newtest"
mode=1
frequency=2412
proto=WPA
key_mgmt=WPA-NONE
pairwise=NONE
group=TKIP
psk="TEST545#@network"
}
Click to expand...
Click to collapse
Run with:
wpa_supplicant -f -Dtiwlan0 -itiwlan0 -c/data/local/adhoc_wpa.conf &
Click to expand...
Click to collapse

I tried the config you suggested for wpa_supplicant, along with a few others, but I can't seem to get a secure connection working. It tries to connect, but times out authenticating.
Maybe someone else will have some better luck with it?

I am guessing you put TEST545#@network as the key right?
But aren't the keys encrypted?
I thought so... the key is encrypted so we need to put a correct encryption as the key http://en.wikipedia.org/wiki/PBKDF2

Wow, this is truly very cool. I am replying right now, tethered via ad hoc.

I can't connect... I am going to try it without the adhoc mode.

It seems like one logical next step would be a dhcp server.
saurik's Debian demonstration is pretty cool but I don't have the skill to get all the dependencies sorted out and cross-compile. Nevertheless, it seems possible:
http://armel-debs.applieddata.net/debian/dists/lenny/main/binary-armel/Packages.gz says:
Code:
Package: dhcp3-server
Priority: optional
Section: net
Installed-Size: 724
Maintainer: Andrew Pollock <[email protected]>
Architecture: armel
Source: dhcp3
Version: 3.1.1-5
[B]Depends: debianutils (>= 2.8.2), dhcp3-common (= 3.1.1-5), lsb-base, libc6 (>= 2.7-1), debconf (>= 0.5) | debconf-2.0[/B]
Suggests: dhcp3-server-ldap
Conflicts: dhcp
Filename: pool/main/d/dhcp3/dhcp3-server_3.1.1-5_armel.deb
Size: 338070
Somebody who can set up the proper build environment and sort out the dependencies could theoretically statically build dhcp3-server.

Awesome! Thanks for the link

ppp over adb (for linux/unix users)

Hey, I was trying to share my internet connection on my laptop with my android phone, so the android could use the laptop's internet connection via usb.
Until somebody compiles an usbnet enabled kernel into an android ROM (this would be the cleanest way), the only way I found for doing this has been emulating the "ppp over ssh" method (search google).
I know, tcp over tcp is a bad idea, but hey, it works!.
Every method I found for doing something similar is to do the opposite: share the phone internet connection with the laptop. I'd like my laptop to be the one that shares the Internet.
The idea here is quite simple:
Code:
pppd nodetach noauth nodeflate pty "ssh [email protected] pppd noauth nodetach notty" ipparam vpn 192.168.0.1:192.168.0.254
pppd in the local host can be connected to pppd in the remote host using a tcp connection, so we can have an IP tunnel between the two endpoints.
The first thing I tried was to replace the ssh part of the command with "adb shell", supposing that adb was going to respect the pipe chain, but it seems that adb doesn't connect its stdin with the shell stdin (try "echo test | adb shell cat", it simply doesn't work)
So, I made it work by using the port redirection feature in adb, and the wonderful "nc". The idea is this:
In the linux host:
Code:
# forward 12000/tcp
adb forward tcp:12000 tcp:12000
# enable routing
sysctl net.ipv4.ip_forward=1
# enable nat
iptables -t nat -I POSTROUTING -s 192.168.0.254 -j MASQUERADE -o eth0
In the android device:
Code:
# delete the default route
ip r del default
# execute pppd listening in 12000/tcp
pppd nodetach noauth pty "nc -l -p 12000" defaultroute
In the linux host:
Code:
# execute pppd connected to 12000/tcp
pppd nodetach noauth nodeflate pty "nc localhost 12000" ipparam vpn 192.168.0.1:192.168.0.254
Et voilà. The android device is accessing the Internet using my laptop's ethernet connection via USB.
I'd like to develop a more user friendly method of doing this, but first I'd like to know if somebody has been working on this already.
BTW, AFAIK this is only for linux/unix users.
EDIT: Sorry, forgot to comment: for some reason, android's pppd version, when doing this kind of things, tries to allocate a pseudo tty under "/dev.pts". As this directory doesn't exists, current pppd will fail.
I had to modify pppd source to allocate the pseudo tty under "/dev/pts" instead of under "/dev.pts". I attach the modified version of the binary.

How reliable is it?
I did the same thing a few months ago, but when I ran some heavy traffic through it, the connection broke and adb started reporting the device as "offline" until re-plugged. Are you able to run heavy traffic on top of it for more than 2-3 minutes?
When I tested it for a min it worked great, but when I really needed to use it (my ADSL went offline and I tried to run my home network's traffic through the G1 via ppp), it went offline every 2-3 minutes and needed replugging.
Correction: I retested my script now, on JF 1.51, and it works reliably. With the old kernel (2.6.25) it was unreliable but with the current one it's fine. I'm tethering over it right now.

i made a script to tethering using this pppd-mod for everyone who is interested
Code:
ADB=/opt/android-sdk-1.5/tools/adb
echo "Setting up..."
$ADB shell "echo 1 > /proc/sys/net/ipv4/ip_forward"
$ADB shell "iptables -t nat -F"
$ADB shell "iptables -t nat -A POSTROUTING -j MASQUERADE -o rmnet0"
$ADB forward tcp:12000 tcp:12000
$ADB shell "killall pppd-mod" &> /dev/null
echo "Starting PPP daemon..."
$ADB shell "pppd-mod noauth pty 'nc -l -p 12000 '" &
sleep 5
echo "Establishing connection..."
pppd noauth nodeflate pty "nc localhost 12000" ipparam vpn 192.168.0.2:192.168.0.1
while [ "`ifconfig | grep 192.168.0.1`" == "" ]; do
sleep 1
done
route del -net 0.0.0.0 &> /dev/null
route add -net 0.0.0.0 gw 192.168.0.1
echo "nameserver 4.2.2.2" > /etc/resolv.conf
echo "Connected."
Still hoping some day regular usb networking will work :-/

mzet said:
i made a script to tethering using this pppd-mod for everyone who is interested
Click to expand...
Click to collapse
Is there anything required phone-side for that to work?

juanmasg said:
Until somebody compiles an usbnet enabled kernel into an android ROM (this would be the cleanest way), the only way I found for doing this has been emulating the "ppp over ssh" method (search google).
Click to expand...
Click to collapse
skyjumper said:
Is there anything required phone-side for that to work?
Click to expand...
Click to collapse
I do believe Cyanogen's 3.9.1 has rudimentary support and he's working on getting it working. Of course the man appears to be on at least 3-4 completely unique vectors (quite impressive, I counted donut, samba, cyanogen mod, and usbnet) so it might be a little bit of time before we get this from him.

skyjumper said:
Is there anything required phone-side for that to work?
Click to expand...
Click to collapse
you have to have binary pppd-mod from first post in your $PATH on your phone and rooted phone with iptables of course

mzet said:
you have to have binary pppd-mod from first post in your $PATH on your phone and rooted phone with iptables of course
Click to expand...
Click to collapse
Ah, didnt even notice the first post had a file. Been looking to do this for some time. Thanks to whoever all helped to get it working.

juanmasg said:
Hey, I was trying to share my internet connection on my laptop with my android phone, so the android could use the laptop's internet connection via usb.
Until somebody compiles an usbnet enabled kernel into an android ROM (this would be the cleanest way), the only way I found for doing this has been emulating the "ppp over ssh" method (search google).
I know, tcp over tcp is a bad idea, but hey, it works!.
Every method I found for doing something similar is to do the opposite: share the phone internet connection with the laptop. I'd like my laptop to be the one that shares the Internet.
The idea here is quite simple:
Code:
pppd nodetach noauth nodeflate pty "ssh [email protected] pppd noauth nodetach notty" ipparam vpn 192.168.0.1:192.168.0.254
pppd in the local host can be connected to pppd in the remote host using a tcp connection, so we can have an IP tunnel between the two endpoints.
The first thing I tried was to replace the ssh part of the command with "adb shell", supposing that adb was going to respect the pipe chain, but it seems that adb doesn't connect its stdin with the shell stdin (try "echo test | adb shell cat", it simply doesn't work)
So, I made it work by using the port redirection feature in adb, and the wonderful "nc". The idea is this:
In the linux host:
Code:
# forward 12000/tcp
adb forward tcp:12000 tcp:12000
# enable routing
sysctl net.ipv4.ip_forward=1
# enable nat
iptables -t nat -I POSTROUTING -s 192.168.0.254 -j MASQUERADE -o eth0
In the android device:
Code:
# delete the default route
ip r del default
# execute pppd listening in 12000/tcp
pppd nodetach noauth pty "nc -l -p 12000" defaultroute
In the linux host:
Code:
# execute pppd connected to 12000/tcp
pppd nodetach noauth nodeflate pty "nc localhost 12000" ipparam vpn 192.168.0.1:192.168.0.254
Et voilà. The android device is accessing the Internet using my laptop's ethernet connection via USB.
I'd like to develop a more user friendly method of doing this, but first I'd like to know if somebody has been working on this already.
BTW, AFAIK this is only for linux/unix users.
EDIT: Sorry, forgot to comment: for some reason, android's pppd version, when doing this kind of things, tries to allocate a pseudo tty under "/dev.pts". As this directory doesn't exists, current pppd will fail.
I had to modify pppd source to allocate the pseudo tty under "/dev/pts" instead of under "/dev.pts". I attach the modified version of the binary.
Click to expand...
Click to collapse
Hello,
I have been trying your method without success. The phone and the computer can ping each other but no connection to the internet. Using wireshark I can't see anything on the eth0 when I try to ping from the phone. All I see is stuff from ppp0 and the loop back. What am I doing wrong?
Thanks

ethernet-over-usb
First, I appreciate juanmasg's initiaive on this much needed feature. thanks!
CyanogenMod thread at http://forum.xda-developers.com/showthread.php?t=539744 talks about experimental ethernet-over-usb functionality (see CHANGELOG for 3.9.1). I don't know how it will be used but it seems he's trying to get it to work. juanmasg can talk to cyanogen for current status and a possible integration of his methodology into his ROMs. I am monitoring his thread for any update on this feature and I just sent a tweet to cyanogen about this. he's a great developer!

With your script .I got these output
Setting up...
Starting PPP daemon...
Establishing connection...
[: 16: unexpected operator
Connected.
And it didn't work.Do you have any ideas?

Sorry for my poor English.
I use a route and the route's ip is 192.168.0.1 ,the computer's ip is 192.168.2.
I think it cause the problem but I don't know how to edit your scipt to make it works.

Hmm. Does anyone know the correct parameters to use the actual "adb ppp" command? I've searched all over the web and nobody has posted any example of how to use this command with the G1. What is the name of the tty device that we should use? etc. etc...

Never mind, I see it now in the adb source code. It's a bit useless as-is, but a small tweak would make it pretty useful. If it was changed to return an interactive_shell() session, and then invoke "pppd notty" in that session, then invoke pppd on the host, it would be a simple means of tethering over USB. The only other thing you'd need is to set up the appropriate NAT rules on either side, depending on whether you want the G1 to share the PC's network, or vice versa.
Too bad pppd insists on setting up a pseudo-tty for itself, there's no need for a tty device driver in scenarios like this.

OK, this is the patch I made to adb to make its ppp command work the way I want.
With that, invoke adb like this:
adb ppp foo notty 192.168.2.1:192.168.2.2
The <tty> parameter is no longer used; everything past the "foo" is just passed as arguments to the local pppd.
Once this is done you can set up NAT forwarding on whichever side you want.
And yes, I know this isn't a clean patch. I should make this a new command instead of usurping the existing ppp command, since presumably the original command is still useful to somebody out there. But this was just a quick hack to see if it would work, and it works great. This saves a lot of the CPU overhead of ssh / port forwarding / etc...

To use the G1's network from the PC, issue these commands on the G1:
# enable routing
sysctl net.ipv4.ip_forward=1
# enable nat
iptables -t nat -I POSTROUTING -s 192.168.2.1 -j MASQUERADE -o rmnet0
(Use tiwlan0 if you want to use the G1's wifi. Not sure why you'd need to do this if the PC already has its own wifi.)
And then set the default route on the PC
route add -net default gw 192.168.2.2
I got about 15-20KB/sec download using EDGE, and about 65KB/sec download using 3G. You may want the "usepeerdns" option in your pppd options, otherwise you'll have to edit /etc/resolv.conf yourself and copy the nameservers from the G1's /system/etc/resolv.conf
To use the PC's network from the G1, just swap the appropriate parameters around. E.g.,
Issue these commands on the PC:
# enable routing
sysctl net.ipv4.ip_forward=1
# enable nat
iptables -t nat -I POSTROUTING -s 192.168.2.2 -j MASQUERADE -o eth0
And issue this command on the G1
route add -net default gw 192.168.2.1

ppp over adb on G2
Hi guys,
I've take your example to do the same on my G2.
I've found some problem and some solution.
This is the script I used:
Code:
#!/bin/sh
ADB=/opt/Android/android-sdk-linux_x86-1.5_r3/tools/adb
echo "Setting up..."
$ADB shell "echo 1 > /proc/sys/net/ipv4/ip_forward"
$ADB forward tcp:12000 tcp:12000
$ADB shell "killall pppd-mod" &> /dev/null
echo "Starting PPP daemon..."
$ADB shell "pppd-mod noauth pty 'nc -l -p 12000 '" &
sleep 5
echo "Establishing connection..."
/usr/sbin/pppd noauth nodeflate pty "nc localhost 12000" ipparam vpn 192.168.0.2:192.168.0.1
while [ "`/sbin/ifconfig | grep 192.168.0.1`" == "" ]; do
sleep 1
done
$ADB shell "iproute add default dev ppp0" &
$ADB shell "iproute del default via 192.168.1.1 dev tiwlan0" &
echo "Connected."
But there is a problem on G2. If the system doesn't believe to be connected (WIFI or 3G) although it can go in internet through the ppp connection it doesn't go on internet.
So to fool it I've created a WIFI connection, not suitable for internet, and then deleted ( in the script ) the default route to tiwlan0.
Somebody know if is possible to believe to Android that it is connected when it isn't?
Bye

im on archlinux and i wanna do this :S how can i ?
i follow the guid in the first page but cant get to it :S when i do the last step on the linux host it says that nc its not a commmand .

anyone plzzz ????

Hi dear,
I don't know archlinux...
However the problem in your situation is that you have to install netcat too.
But if you need more help please tell us which problem you encounter with more detail.
Bye
Zioalex

zioalex said:
Hi dear,
I don't know archlinux...
However the problem in your situation is that you have to install netcat too.
But if you need more help please tell us which problem you encounter with more detail.
Bye
Zioalex
Click to expand...
Click to collapse
gonna try installing netcant and comment, thx !!!!

[REQ] Reverse wired tethering

Before i start i want to let people know YES I DO HAVE A WIRELESS ROUTER!! So please do not respond telling me to just go buy a router.
REQUEST - Reverse wired tethering. I.E. Sharing PC's iNet connection with your phone via USB.
REASON - My university's wireless is locked down and does not allow mobile phones, pda's to connect up to our wireless without submitting MAC for approval. Looking to sync certain apps without using my data connection.
I dont know if anyone has played around with trying to get this working or not. I know its a small market of people who may be interested in this, but for certain places (CANADA) where data charges are WAY to expensive this could be handy for students at UNI where wireless is not an option.

get a second wifi adapter on your laptop, and share your uni wireless network connection with the second wifi adapter. Use a hidden SSID, then no one will know what is going on

This was asked a couple of times before here and I remember people saying you couldn't reverse the tethering.You could try though.

alexperkins said:
get a second wifi adapter on your laptop, and share your uni wireless network connection with the second wifi adapter. Use a hidden SSID, then no one will know what is going on
Click to expand...
Click to collapse
Thats a good idea xD

Hey guys,
I have been trying to find a way to do this for a long time.
The best solution i have found (actually the only solution) is Connectify. The only downside is you must have Win7.
What it does is turns your wifi adapter into a HotSpot, even if you are using wifi to get the net in the first place. Its a great tool and should be what your after.
http://www.connectify.me/

memphisraynz said:
Hey guys,
I have been trying to find a way to do this for a long time.
The best solution i have found (actually the only solution) is Connectify. The only downside is you must have Win7.
What it does is turns your wifi adapter into a HotSpot, even if you are using wifi to get the net in the first place. Its a great tool and should be what your after.
http://www.connectify.me/
Click to expand...
Click to collapse
thank you so much for this

Your best solution is the WiFi adapter. You could most likely get away with a SOCKS proxy over USB, possibly using adb, but it would be complicated, unstable, and messy.

I still don't know you just don't use your wireless router. I assume they have wired. Clone your PC's mac address and hook it up. Universities are retarded with that crap. They have the worst networks and security.
If no wired, then what podunk place is it? haha
Even if they had only wireless , you could set up a wlan client and repeat it. DDWRT, etc, ftw.

Just get backtrack for your laptop and spoof your mac to all 0 then grab connect to the network at your school the spoofed mac will allow you to browse so long as no other encyption is on the network such as WEP or WPA.
then you can try to flood all the ports on the network so no one else can connect then spoof your phones mac by conneecting to your laptop through wireless as an adhoc connection and while staying connected through adhoc load a second server through the same wireless network card and you can connect to the achools network again. and walla...

death1246 said:
Just get backtrack for your laptop and spoof your mac to all 0 then grab connect to the network at your school the spoofed mac will allow you to browse so long as no other encyption is on the network such as WEP or WPA.
then you can try to flood all the ports on the network so no one else can connect then spoof your phones mac by conneecting to your laptop through wireless as an adhoc connection and while staying connected through adhoc load a second server through the same wireless network card and you can connect to the achools network again. and walla...
Click to expand...
Click to collapse
so simple, i dunno why i didnt think of that. thanks! lol

Well its quit simple once you learn your way around linux...

If you have any experience with *nix, you may want to look at Cyanogen's original usb tether shell script:
http://github.com/cyanogen/android_vendor_cyanogen/blob/master/bin/usb-tether
Basically you could use the internet connection sharing function that comes with all popular OSes and access your uni's network on your phone. You must have Cyanogen mod or another mod using his kernel. Not yet working on OSX for some reason. Tested under Windows 7.
First you'll need to figure out what IP address range your computer's DHCP server is using. This is normally fixed for each OS. For Windows 7, it's always 192.168.137.0/24.
For OSX or Linux, you can setup connection sharing (for some other connection because we don't have the USB interface yet) and ifconfig.
Second is to enable the USB connection on the phone's side. Type the following command in any console program, like Connectbot. (You must use a console program as opposed to adb because you will lose USB debugging once the USB network interface is enabled.)
Code:
su
cd /sys/devices/virtual/net/usb0
ifconfig usb0 192.168.137.200 mask 255.255.255.0
echo 1 > enable
The first line makes you the superuser. (Skip if the command prompt is #)
The second line land you in usb0's directory under sys. We'll need to type the disable command later, so it's easier if we're here.
The third line brings up the virtual usb network interface and sets its IP address.
The IP address should be in the same network (i.e. IP address range) you obtained in step 1. Say if the original is 192.168.137.1 in a /24, you can use 192.168.137.2 through 192.168.137.254
This actually enables the usb interface.
You will now see a new network adapter is recognized by your computer. Set up connection sharing to share your internet TO that adapter.
Make sure you have connection by pinging your computer from your phone.
For example:
ping 192.168.137.1
Now you'll have to change the routes so traffic go through the USB cable instead of the mobile network.(# is the command prompt, do not enter)
# busybox route
check the line starting with "default". Write down the ip address after it; call it IP1.
# getprop net.dns1
Call the IP returned IP2.
Code:
busybox route del default gw IP1
busybox route add -host IP2 rmnet0
busybox route add default gw 192.168.137.1
The first line deletes the old default route via the mobile network.
The second line adds an "exception" for your carrier's DNS server.
The third line adds the new route via USB. You should replace the address at the end with the IP address from the first step.
Your network should be working now. Test by visiting some website that is only available on campus or by traceroute.
You must make sure the mobile network is always connected though. This is because domain names are still resolved by your mobile carrier. If you ever lose your mobile connection, the routing table will be changed as well.
To disconnect:
Make sure you're still in /sys/devices/virtual/net/usb0.(Use pwd if unsure.)
Code:
netcfg usb0 down
echo 0 > enable
The usb interface will disappear on your computer.
Now switch the phone to airplane mode and back to re-enable mobile network.
The disconnect step should always restore your phone's state.
// This is written at 3am, so use it at your own risk...

help?
look at this
http://superuser.com/questions/91699/spoof-mac-address-from-ip-command
bg

It's really sad that Android can't reverse tether. If you want to use your laptop's AdHoc connection you have to do serious hacking to the tiwlan.ini and the wpa_supplicant.conf. There is no way to connect via bluetooth ar USB.
I'm seriously considering WP7 now for my next OS of choice... A nd for everyone saying "go buy a router" - go buy a router and stick it up your .... nose.

Hi,
I have the same problem. No WiFi in my work and no WiFi in my current home (a Resident Hall). There's no possibility to buy a WiFi router, of course. I tried to hack the system to connect ad-hoc networks but it didn't work.
I have found some interesting resources:
sluniverse.com/php/vb/blogs/psyke+phaeton/1042-making-android-phone-use-your.html
letsgoustc.spaces.live.com/blog/cns!89AD27DFB5E249BA!877.entry
I have a HTC Magic with the ADP-DRC83 hacked ROM with Usb tethering integrated. But usb0 interface in the mobile is configured to provide Internet connection (as gateway) to the PC, not the reverse functionality: connecting the mobile to Internet through the PC. So, all I need is to change the gateway in Android and then configure a NAT-DNS in my linux PC (easy with iptables and dnsmasq). But, I don't know how automatize the process exactly.

digitaljeff said:
but for certain places (CANADA) where data charges are WAY to expensive this could be handy for students at UNI where wireless is not an option.
Click to expand...
Click to collapse
Wind will be launching in vancouver soon.
$35 unlimited data.

Silly ragin' cajun.

Ok, now it works. Here it's my procedure for a HTC Magic (Sapphire) without any APN previously configured from Telecom provider and ROM CSDIv4.
In the mobile by using Better Terminal:
Code:
su
cd /sys/devices/virtual/net/usb0
echo 1 > enable
ifconfig usb0 192.168.2.2 mask 255.255.255.0
busybox route add default gw 192.168.2.1
setprop net.dns1 8.8.8.8
In the linux computer:
Code:
sudo sysctl -w net.ipv4.ip_forward=1
sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
sudo iptables -A FORWARD -i usb0 -j ACCEPT
sudo ifconfig usb0 192.168.2.1 netmask 255.255.255.0
Android Market downloads and location service don't work but I think is possible if you switch on the WiFi.
Update: Syncronization, Android Market downloads and location service don't work even the WiFi antenna is switched on. I have added the iptables commands also.

Well gosh, reverse wireless tethering is so much simpler

There are another similar thread: http://forum.xda-developers.com/showthread.php?t=522498

Motorola Milestone Ad-hoc wifi for the needed

After trying several methods (tiwlan.ini, wpa_supplicant.conf, wpa_supplicant patch) to get my Motorola Milestone to connect to my Laptop's Adhoc wifi network with no success, i finally come up with a solution. Now I am sharing it here hoping it will help those with the same problem.
The idea is to use Barnacle (on Market) to first setup a connection with the laptop, then re-config it to make the sharing work in the reverse direction.
Steps are as followed:
1. Start Barnacle (you may check "Local Mode" in Settings to go ahead without a data connection in phone), then connect your laptop to the wireless network it creates (named milestones or so). After this step, your phone's IP will be something like :192.168.5.1, and your Laptop's IP will be something like: 192.168.5.100
2. Start sharing your data connection from Laptop, in doing that, your Laptop's IP will be forcibly set to 192.168.0.1 (yours may be different, just note that this IP will be used as default gateway we use in the next step)
3. Now the configuration part:
//Start adb shell by entering at Cmd prompt
adb shell
$
su
#
//mannualy set IP for your phone, can be anything in form of 192.168.0.xxx
# ifconfig tiwlan0 192.168.0.2 netmask 255.255.255.0
//manually set the default gateway of the phone to the Laptop's IP at this time
# route add default gw 192.168.0.1 dev tiwlan0
After these steps, the phone can access the internet via the Laptop's connection. We will complete the remaining by manually specifying a DNS for the phone
# setprop net.dns1 #.#.#.# (here you should replace the #.#.#.# to a known IP address of your ISP's DNS, in worst case you may use Google's DNS)
//Now test with ping to see if we receive any response:
# ping -c 4 192.168.0.1 => the Laptop should answer
# ping -c 4 191.168.0.2 => phone are pinging itself, the phone should answer
# ping -c 4 209.85.175.106 => some server in the Internet should answer
# ping -c 4 www dot google dot com => Google should answer
If the tests above are all OK, you are done, enjoy the internet from your phone !
have tried :
+ Mail OK
+ Browser OK
+ Internet radio OK
+ Market nearly OK (in here the app browsing is OK, but download seem stuck)
Please confirm your result,
Codelavie

not working. i follow your guide exactly, but it didn't work. how can you do that? where am i wrong?

Didn't work for me either. After quite a hard experience I've managed to compile a wpa_supplicant with adhoc support for Milestone 2.1-update1 after applying szym's patch, and so far it works fine. The only thing you need to do is substituting the original system/bin/wpa_supplicant for the patched one, and restart wifi. I cant post the link yet because I'm new in the forums, but I'll post it as soon as i can.

Solution to Tethering + OpenVPN issues on KitKat/4.4

I was previously using a stock rooted Nexus 4 (with 4.3) with "OpenVPN Connect" (net.openvpn.openvpn) and android built-in wifi tethering to tunnel tethered clients through the OpenVPN connection. This required some iptables modifications but worked fine.
With a stock rooted Nexus 5 (with 4.4.0) and OpenVPN Connect 1.1.12, this stopped working and that was really annoying.
Part of the issue was the one described here
But it was more complicated. It seems that there are routing table issues that I had to research a bunch.
Here are the iptables commands that I already had to run even on the Nexus 4 (with 4.3), which I got from here
Code:
iptables -t filter -F FORWARD
iptables -t nat -F POSTROUTING
iptables -t filter -I FORWARD -j ACCEPT
iptables -t nat -I POSTROUTING -j MASQUERADE
These (above) are somewhat liberal firewall rules that you may what to refine for more security.
But below are additional routing entries that I needed to add specifically for the Nexus 5 (with 4.4.0). They force tethered clients to route through the VPN, unless their traffic is a broadcast or designated for the wifi LAN. Those exceptions are required for DHCP to work on the tethered client. They assume the tethered LAN is 192.168.43.XYZ and the OpenVPN interface is tun0.
Code:
ip rule add from 192.168.43.0/24 lookup 61
ip route add default dev tun0 scope link table 61
ip route add 192.168.43.0/24 dev wlan0 scope link table 61
ip route add broadcast 255.255.255.255 dev wlan0 scope link table 61
This seems to all work best if I start OpenVPN after activating tethering, not before.
I'm not entirely clear whether this is a result of some change/bug in KitKat, or an incompatibility in "OpenVPN Connect", or both. I wonder if it would work ok with other OpenVPN clients like "OpenVPN for Android" (de.blinkt.openvpn)
Other Notes:
* Server is OpenVPN 2.3.2
* Server has this line set in its config:
Code:
push "redirect-gateway autolocal def1"

Running android 4.4.2 google stock image with SuperSU on LG Nexus 4. These routing commands worked great and allowed me to tunnel all WiFi tethered traffic through my VPN. Thanks for figuring this out it was bugging me!

Im stock 4.4.2 no root or anything just pure stock i download install openvpn from google play and imported my config files click connect then open PDAnet connect and the Ip is changed.

OK, so I'm having a bit of trouble understanding and implementing the fix for my nexus 5. I've already got WiFi tethering working through the sqlite db fix but now I can't get my connection to work when my VPN (PIA official app) is broadcasting. These commands you're sending, are they done on the phone terminal or computer and is that EXACTLY how theyre being entered. For rules in red where would I find the IP I would use. Thanks guys Id really appreciate any help given.

Worked!
scootley said:
This seems to all work best if I start OpenVPN after activating tethering, not before.
Click to expand...
Click to collapse
Thanks scootley! These worked me on 4.3. I activated my hotspot before OpenVPN, but I used
Code:
iptables --flush
first before entering your commands. Seems to help. My OpenVPN server config also has the following in addition to push redirect:
Code:
push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"
push "redirect-gateway autolocal def1"
Jrock2t5 said:
OK, so I'm having a bit of trouble understanding and implementing the fix for my nexus 5. I've already got WiFi tethering working through the sqlite db fix but now I can't get my connection to work when my VPN (PIA official app) is broadcasting. These commands you're sending, are they done on the phone terminal or computer and is that EXACTLY how theyre being entered. For rules in red where would I find the IP I would use. Thanks guys Id really appreciate any help given.
Click to expand...
Click to collapse
These commands are entered on the phone. You can download Terminal Emulator or something similar through the app store.
First make sure you're connect to your hotspot from your computer. Next, let's find your local IP address. Here are the instructions for Windows:
Click on the Start menu and type cmd. When you see the cmd applications in Start menu panel, click it or just press enter.
A command line window will open. Type ipconfig and press enter.
You'll see a bunch of information, but the line you want to look for is "IPv4 Address." The number across from that text is your local IP address.
Here's how to do the same thing on a Mac:
Open System Preferences (via the Apple menu at the top lefthand corner of your screen).
When System Preferences opens, click on the icon labeled Network.
You should see a few options on the left with labels like Wi-Fi, Ethernet, Bluetooth, etc. The ones with green dots have IP addresses assigned to them. Click the one on top (if it isn't already selected) and look to the right. There should be a sentence that reads something like "Wi-Fi is connected to Chocolate and has the IP address 192.168.1.102." The number at the end of that sentence is your local IP address.

Thanks for this thread, I've nearly got tethering working through Private Internet Access/Open VPN.
When running the commands
Code:
ip rule add from 192.168.43.0/24 lookup 61
ip route add default dev tun0 scope link table 61
ip route add 192.168.43.0/24 dev wlan0 scope link table 61
ip route add broadcast 255.255.255.255 dev wlan0 scope link table 61
i get an error "RTNETLINK answers: File exists"
I tethered up while connected to the VPN and could ping out to external IP addresses but no DNS resolution. So in my windows settings I manually specified DNS settings and can now browse the web through the VPN on my Galaxy s4!
But how do I fix the DNS issue? I want the clients that connect to pick up the DNS settings that actually work, without having to manually specify.
Thanks for any help

Vpn problem
Hi I havent tried the above options..yet
I have a sgs3 sgh-t999 . a comercial vpn account with the xxx.ovpn cert files.
after getting the details entered into open vpn and importing the cert file all is good untill I go to connect [see attachment]
phone is v4.3, baseband mjc, kernel v 3.0.31, rom S3rx v3.0 1-27-14
any suggestions on how to proceed?

RXP said:
Thanks for this thread, I've nearly got tethering working through Private Internet Access/Open VPN.
When running the commands
Code:
ip rule add from 192.168.43.0/24 lookup 61
ip route add default dev tun0 scope link table 61
ip route add 192.168.43.0/24 dev wlan0 scope link table 61
ip route add broadcast 255.255.255.255 dev wlan0 scope link table 61
i get an error "RTNETLINK answers: File exists"
I tethered up while connected to the VPN and could ping out to external IP addresses but no DNS resolution. So in my windows settings I manually specified DNS settings and can now browse the web through the VPN on my Galaxy s4!
But how do I fix the DNS issue? I want the clients that connect to pick up the DNS settings that actually work, without having to manually specify.
Thanks for any help
Click to expand...
Click to collapse
1) RTNETLINK answers: File exists
This just means you already ran the command before during this reboot session and it's saved into the route table. If you restart your phone, and run the commands again, it will go through first time, but repeated commands will yield same error. Should be normal. Table clears on reboot.
2) Please see the thread at http://forum.xda-developers.com/galaxy-s2/help/solved-wifi-hotspot-issue-samsung-t1689242
It seems like in order for OpenVPN DNS push to work, you have to change your APN settings on your phone to have it automatically register and push out to your other devices. I had the same problem and came across this during a search.

Massive thanks to the OP for posting this here and to everyone helping out in this thread.
The above rules route wifi tethered traffic via the vpn but I was wondering if there are similar rules to route usb tether too?
Cheers

It seems to work once, but when Data connection is lost or openvpn reconnects, wifi tathering stops working, need to do everything again (switch all off, connect to 3G, vpn, create wifi hotspot and apply fix script). And somehow DNS doesn't work. Tryed on Galaxy S5, LG L70, both on 4.4.2
But in general, this workaround is working, just needs a little bit of tweaking

This is fantastic.
For those of you using VPN on your phone as well, does it seem to stay connected? My VPN (OpenVPN) was flawless on 4.3 ... I mean smooth as ice with no disconnects.
When I upgraded to Kitkat, I wanted to immediately hide in a hole from embarrassment. Only after trying to connect and stay connected did I start to read around to check what the heck was going on. Biggest mistake ever. But then again, who would have thought right? I mean come on...who would have thought it would make using VPN a nightmare after an update that's suppose to be improved? Whatever...
Anyhow, lesson learned. Now I'm waiting desperately for someone to figure out how to downgrade from 4.4 back to 4.3 and/or to find a patch/fix for this issue so we don't have to run a script on every boot or reset.
At the end of the day, at least there is a solution thanks to folks like you. Kudos to the OP and everyone else who has contributed to the work around...for the time being lets hope...
:good:

For anyone interested, I played with the commands to have it work over a USB tether instead of Wifi. Why? Because my battery life stinks and this way my phone is charging also. What the heck. works great.
The only change was in the two spots where it has "wlan0" change them to "usb0". Another change was that the subnet of the USB connection is 192.168.42.0/24 (versus 192.168.43.0/24 on wifi). I get it working in this order:
1) reboot phone (to make sure to other lingering route tables are wiped out
2) turn off wifi
3) establish VPN connection
4) start USB tethering (and have your phone usb connected to your computer
5) After eveything is hooked up, open a terminal window, make sure you have superuser access (su) and execute the commands below. I just have them saved in a text file on my phone's sd card, copy them and just paste them all at once into the terminal window. Haven't figured out how to get this to run automatically using init.d (yet - assuming you can because upon phone reboot, I have to assuming that it will spit out errors because the tun0 and usb0 devices will not exist!)
iptables -t filter -F FORWARD
iptables -t nat -F POSTROUTING
iptables -t filter -I FORWARD -j ACCEPT
iptables -t nat -I POSTROUTING -j MASQUERADE
ip rule add from 192.168.42.0/24 lookup 61
ip route add default dev tun0 scope link table 61
ip route add 192.168.42.0/24 dev usb0 scope link table 61
ip route add broadcast 255.255.255.255 dev usb0 scope link table 61

Vpn api delete route joy downgraded
@grogargh
Have you tried Tasker, run shell
To run after booting [or from widget or otherwise]
http://forum.xda-developers.com/showthread.php?t=1110775