1. # interfaces config
  2. auto lo
  4. iface lo inet loopback
  6. iface eth0 inet static
  7. address <external ip>
  8. netmask 255.255.255.248
  9. dns-nameservers <some dns server>
  10. dns-search mydomain
  11. post-up route add default gw <default gw> dev eth0
  12. pre-down route del default gw <default gw> dev eth0
  14. # usb network
  15. allow-hotplug eth1
  16. iface eth1 inet static
  17. address 192.168.3.254
  18. netmask 255.255.255.0
  19. post-up route add -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  20. post-up route add -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  21. post-up route add -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  22. post-up route add -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  23. pre-down route del -net 192.168.0.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  24. pre-down route del -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  25. pre-down route del -net 192.168.2.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1
  26. pre-down route del -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.3.1 dev eth1