auto eth0 eth1 eth2

iface eth0 inet static
        address 192.168.1.2
        netmask 255.255.255.0
        network 192.168.1.0
        broadcast 192.168.1.255
        dns-nameservers 192.168.1.2
        dns-search internal.domain.com
        post-up iptables-restore < /etc/iptables.up.rules
        gateway 192.168.1.1
        up ip route add table fiber scope link proto kernel dev eth0 192.168.1.0/24

iface eth1 inet static
        address 10.254.239.1
        netmask 255.255.255.0
        network 10.254.239.0
        broadcast 10.254.239.255
        up ip route add table fiber scope link proto kernel dev eth1 10.254.239.0/24


iface eth2 inet static
        address 20.20.20.22
        netmask 255.255.255.248
        network 20.20.20.20
        broadcast 20.20.20.27
        up ip route add table fiber scope link proto kernel dev eth2 20.20.20.20/29
        up ip route add default via 20.20.20.21 table fiber
        up ip rule add fwmark 2 table fiber