Ubuntu: Share internet connections with other computers

You can configure a Ubuntu system as a gateway in order to share it's internet connection (maybe via WLAN or tethering) with other computers on the network.

On the gateway

Enable ip traffic forwarding:
- Open /etc/sysctl.conf
- Uncomment the line
```
net.ipv4.ip_forward=1
```
- Reload using sudo sysctl -p /etc/sysctl.conf
Reconfigure ip_tables to allow NAT:
- Download the attached file
- Replace online_device with the name of the network device that provides the internet connection
- Replace lan_device with the name of the network device that connects to the LAN
- Run the script with sudo

On the client PC

Add the gateway PC as the default gateway using

sudo ip route del default
sudo ip route add default via <ip of gateway pc>

Add another DNS server to /etc/resolv.conf, for example

nameserver 8.8.8.8

enable_gateway

Tobias Kraze

makandra.de

Say thanks11

Last edit

2017-07-06

Tobias Kraze

Attachments

enable_gateway

License

Source code in this card is licensed under the MIT License.

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Posted by Tobias Kraze to makandra dev (2017-07-06 10:23)

Ubuntu: Share internet connections with other computers

On the gateway

On the client PC

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