Sharing Internet connection using bridge mode

• Sharing via bridge mode
• Installing bridge-utils
• Notes

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