Sharing Internet connection using bridge mode

Last update on September 29, 2009 10:18 AM by jad05
Published by netty5

Sharing Internet connection using bridge mode






Internet connection can be shared with another computer if you have a free Ethernet port

Sharing via bridge mode


When using a box, first activate the router functions of your box so that it can assign different IP to each PC.

E.g
Imagine that you have a PC with 2 Ethernet interface:

eth0 is connected to the Internet (and is automatically assigned IP 192.168.0.x by the dhcp.
eth1 is a free interface (configured with a fixed IP 10.0.0.1).



Your /etc/network/interfaces file must look like this: 
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto eth1
iface eth1 inet static
address 10.0.0.1
netmask 255.255.255.0


We will connect a second PC to the eth1 port like this:



Making use of the bridge implies that any Ethernet frame received on an ethernet interface (eth0 or eth1) will be re-issued on the other. Just like hen connecting 2 PC via a hub.



PC2 will have its IP address automatically assigned by the box, and can connect directly to the Internet.
Installation

Installing bridge-utils


Type: sudo apt-get install bridge-utils

Change the configuration

Modify the /etc/network/interfaces file 

auto lo
iface lo inet loopback

auto br0
iface br0 inet dhcp
bridge_ports eth0 eth1

auto eth1
iface eth1 inet static
address 10.0.0.1
netmask 255.255.255.0

Notes


To validate this configuration, type: sudo /etc/init.d/networking restart

The bridge br0 is configured to obtain IP address via DHCP and then is asked to connect "virtually" eth0 and eth1 with using the following command: bridge_ports eth0 eth1.

On PC2, you just have to configure it with DHCP (automatic IP address).
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