Connect a android go device to my computers wifi spot and share the vpn

linux-man · 06-23-2022, 11:19 PM

I need to connect a Android Go device to my computers wifi spot, and then allow the device to only go thru my computers vpn client to the internet.Two articles below relate to the topic of sharing vpn, however I need guidance as I am afraid of doing something detrimental to my computer in terminal. Thanks in advance.

https://askubuntu.com/questions/9261...ther-lan-users
https://kamranzafar.org/2012/08/16/s...tion-on-linux/

business_kid · 06-25-2022, 04:31 AM

Thanks for the articles - I'm intending to try something similar myself. The sensible way to do it is to get a wired connection for your vpn box, and make the WIFI an access point for the house. Otherwise you'll have endless wifi trouble. I was going to tackle it:

Get a free vpn running on something.
Duplicate it on a box I can leave on 24/7.
Set up wifi access point on the 24/7 box.
Turn off router wifi.

How much of this have you got running?

EDIT:I should say I have a RazPi 4 on here 24/7 running linux to make the rest of what I said intelligible.

linux-man · 06-26-2022, 03:50 AM

Quote:

Originally Posted by business_kid

How much of this have you got running?

None other than working vpn connection and wifi adpater that came with computer.

Code:

cat /proc/sys/net/ipv4/ip_forward  #(this should return `1`)

According to https://askubuntu.com/questions/9261...ther-lan-users I need to start with above code? Would it be harmless to my system if I did?

michaelk · 06-26-2022, 05:34 AM

Yes, it is basically harmless. ip_forward routes traffic from one interface to another. It is usually set to disable (0) at start so rebooting will restore defaults. To set permanent you need to change the sysctl.conf file.

business_kid · 06-26-2022, 06:27 AM

Quote:

According to https://askubuntu.com/questions/9261...ther-lan-users I need to start with above code? Would it be harmless to my system if I did?

It' effectively turning your box into a network gateway. And as your traffic goes to the VPN, you get the benefit of the VPN. It's

Code:

echo 1 > /proc/sys/net/ipv4/ip_forward # to set IPV4 forwarding
cat /proc/sys/net/ipv4/ip_forward #Should be 1 if IPV4 forwarding is set

linux-man · 06-28-2022, 10:00 PM

Should I be expecting something more after the greater than sign?

Code:

$cat /proc/sys/net/ipv4/ip_forward  #(this should return `1`)
0
$echo '1' >> /proc/sys/net/ipv4/ip_forward`  
> 
>

I wasn't able to get the name of my built-in wifi adapter to set up the iptables as per point 2 of https://askubuntu.com/questions/9261...ther-lan-users

Code:

$cat /proc/sys/net/ipv4/ip_forward  #(this should return `1`)
0
$echo '1' >> /proc/sys/net/ipv4/ip_forward`  
> ip link
> ifconfig
>

michaelk · 06-28-2022, 10:47 PM

Without actually seeing the output no one can tell either.
Is the wifi adapter USB or builtin?
If USB post the output of the lsusb command.
If builtin show us the output of the lspci command specific to the wireless adapter.

linux-man · 06-29-2022, 02:18 AM

Quote:

Originally Posted by michaelk

Without actually seeing the output no one can tell either.
Is the wifi adapter USB or builtin?

builtin

Quote:

Originally Posted by michaelk

If builtin show us the output of the lspci command specific to the wireless adapter.

Code:

03:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8822CE 802.11ac PCIe Wireless Network Adapter

michaelk · 06-29-2022, 07:49 AM

What distribution are you running? Looks like this wireless adapter needs at least a 5.2 kernel.
https://linux-hardware.org/?id=pci:1...3b-3750&page=1

I don't know if this adapter is capable of being an access point but you can test it via the command

sudo iwconfig <adapter ID> mode master

teckk · 06-29-2022, 12:49 PM

Quote:

Should I be expecting something more after the greater than sign?

Quote:

echo '1' >> /proc/sys/net/ipv4/ip_forward`

Why is there a lone backtick at the end of the line?
Or is that a typo? That will error.

linux-man · 06-29-2022, 08:27 PM

Quote:

Originally Posted by michaelk

What distribution are you running? Looks like this wireless adapter needs at least a 5.2 kernel.

5.14.0-9parrot1 home edition

Quote:

Originally Posted by michaelk

I don't know if this adapter is capable of being an access point

Code:

sudo iwconfig 10ec:c822 mode master
Error for wireless request "Set Mode" (8B06) :
    SET failed on device 10ec:c822 ; No such device.

I assumed 10ec:c822 is the ID as mentioned here https://linux-hardware.org/?id=pci:1...3b-3750&page=1

linux-man · 06-29-2022, 08:37 PM

Quote:

Originally Posted by teckk

Why is there a lone backtick at the end of the line?
Or is that a typo? That will error.

I copied and pasted as is from https://askubuntu.com/questions/9261...ther-lan-users

Without the backtick

Code:

echo '1' >> /proc/sys/net/ipv4/ip_forward
bash: /proc/sys/net/ipv4/ip_forward: Permission denied

What about the ticks on the number one and double greater than signs, should they stay as is?

michaelk · 06-29-2022, 08:48 PM

The device ID in the old days would be wlan0 with consistent naming it is something like wlxxxxxx.

It the device is recognized correctly it should be seen in the output of iwconfig, ip or ifconfig.

The single quotes around the 1 just prevent the shell from interpreting any special characters. You have to be root or use sudo to write to /proc

Should be a single >. I have never tried to see what happens if you use two.

The > is redirection, a single > over writes the destination file, >> appends.

linux-man · 07-02-2022, 09:55 PM

Quote:

Originally Posted by michaelk

The device ID in the old days would be wlan0 with consistent naming it is something like wlxxxxxx... it should be seen in the output of iwconfig, ip or ifconfig.

Is this it?

Code:

iwconfig
wlan0     IEEE 802.11  ESSID:off/any

michaelk · 07-02-2022, 10:00 PM

Yes, that is it.