Here is what is in my /etc/network/interfaces file:

auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 172.168.10.252
netmask 255.255.255.0
network 172.168.10.0
broadcast 172.168.10.255
gateway 172.168.10.1
iface eth1 inet static
address 172.168.10.251
netmask 255.255.255.0
network 172.168.10.0
broadcast 172.168.10.255
gateway 172.168.10.10

I would like to use eth0 as for local network and eth1 for internet. Thanks

1

1 Answer

To configure two interfaces say eth0 and eth1 to use two networks 192.168.0.0/24 and 10.10.0.0/24 a tool iproute2can be used to achieve this.

Steps:

1. Edit your /etc/network/interfaces:

   auto lo
   iface lo inet loopback
   # The primary network interface
   allow-hotplug eth0
   iface eth0 inet static address 192.168.0.10 netmask 255.255.255.0 gateway 192.168.0.1
   # The secondary network interface
   allow-hotplug eth1 iface eth1 inet static address 10.10.0.10 netmask 255.255.255.0

2. Add second routing table by editing `/etc/iproute2/rt_tables:

   #
   # reserved values
   #
   255 local
   254 main
   253 default
   0 unspec
   #
   # local
   #
   #1 inr.ruhep
   1 rt2

3. Populate new routing table:

   ip route add 10.10.0.0/24 dev eth1 src 10.10.0.10 table rt2
   ip route add default via 10.10.0.1 dev eth1 table rt2
   # The first command says that the network, 10.10.0.0/24, can be reached through the eth1 interface.
   # The second command sets the default gateway.

4. Add routing rules:

   ip rule add from 10.10.0.10/32 table rt2
   ip rule add to 10.10.0.10/32 table rt2
   # These rules say that both traffic from the IP address, 10.10.0.10, as well as traffic directed to
   # or through this IP address, should use the rt2 routing table

5. Making the Configuration permanent by adding it to /etc/network/interfaces:

   iface eth1 inet static address 10.10.0.10 netmask 255.255.255.0 post-up ip route add 10.10.0.0/24 dev eth1 src 10.10.0.10 table rt2 post-up ip route add default via 10.10.0.1 dev eth1 table rt2 post-up ip rule add from 10.10.0.10/32 table rt2 post-up ip rule add to 10.10.0.10/32 table rt2

Source:

4

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