Bridging Network Connections

Install

apt-get install bridge-utils

Start the bridge:

brctl addbr br0

Edit: /etc/network/interfaces

# The loopback network interface
auto lo
iface lo inet loopback

# Bridge between eth0 and eth1
auto br0

# DHCP would look like this but we will use static
# iface br0 inet dhcp

iface br0 inet static
address 192.168.1.100
network 192.168.1.0
gateway 192.168.1.1
broadcast 192.168.1.255
netmask 255.255.255.0
dns-nameservers 192.168.1.1
#dns-search example.com 

  pre-up ip link set eth0 down
  pre-up ip link set eth1 down
  pre-up brctl addbr br0
  pre-up brctl addif br0 eth0 eth1
  pre-up ip addr flush dev eth0
  pre-up ip addr flush dev eth1
  post-down ip link set eth0 down
  post-down ip link set eth1 down
  post-down ip link set br0 down
  post-down brctl delif br0 eth0 eth1
  post-down brctl delbr br0

Restart network:

/etc/init.d/networking stop
/etc/init.d/networking start

Turn on the bridge:

ip link set br0 up

Let’s check:

ifconfig
brctl show
ip addr show

Bridge Notes: How to remove a bridge {bring down first then delete}

ip link set br0 down
brctl delbr br0

LXC Setup

#cat /etc/network/interfaces
auto lo
iface lo inet loopback
up route add -net 127.0.0.0 netmask 255.0.0.0 dev lo
down route add -net 127.0.0.0 netmask 255.0.0.0 dev lo

# device: eth0
auto eth0
iface eth0 inet manual

auto br0
iface br0 inet static
	   address 70.22.189.58
	   netmask 255.255.255.248
	   gateway 70.22.189.57
	   broadcast 70.22.189.63
	   bridge_ports eth0
	   bridge_fd 0
	   bridge_maxwait 0
	   bridge_stp off
	    post-up ip route add 70.22.189.59 dev br0
	    post-up ip route add 70.22.189.60 dev br0
	    post-up ip route add 70.22.189.61 dev br0
	    post-up ip route add 70.22.189.62 dev br0

More info at: shorewall.net