Debian Switch

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Debian IPv4 Software Bridge

Only two files need changes to the basic Debian installation to run a software bridge. In the settings below, eth4 is the connection to the Internet and eth0 - eth3 are acting as a switch.

/etc/network/interfaces 

auto lo
iface lo inet loopback
 
allow-hotplug eth4
auto eth4
iface eth4 inet dhcp

allow-hotplug eth0
iface eth0 inet manual
   pre-up   ifconfig $IFACE up
   pre-down ifconfig $IFACE down

allow-hotplug eth1
iface eth1 inet manual
   pre-up   ifconfig $IFACE up
   pre-down ifconfig $IFACE down

allow-hotplug eth2
iface eth2 inet manual
   pre-up   ifconfig $IFACE up 
   pre-down ifconfig $IFACE down

allow-hotplug eth3
iface eth3 inet manual
   pre-up   ifconfig $IFACE up
   pre-down ifconfig $IFACE down

auto br0
iface br0 inet static
  bridge_ports eth0 eth1 eth2 eth3
  address 192.168.1.1
  broadcast 192.169.1.255
  netmask 255.255.255.0

/etc/rc.local 

iptables -t nat -A POSTROUTING -o eth4 -j MASQUERADE
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