I have the same problem with a manual configuration and 2 nics on separate networks.
The following started working after uninstalling network-manager auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 auto eth1 iface eth1 inet static address 192.168.0.2 netmask 255.255.255.0 network 192.168.0.0 broadcast 192.168.0.255 gateway 192.168.0.1 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 4.2.2.2 post-up /etc/init.d/firestarter restart post-up echo `/bin/date` > /home/tolan/last_firewall_renew post-up /usr/sbin/ddclient -- Can't configure IP addr's on multiple NICs https://launchpad.net/bugs/94068 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs