I have a workstation with two ethernet ports (eth0, eth1), the problem is that I cannot run with both ports up and running. I can run with either one of them, but not both.
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address 172.22.221.29
netmask 255.255.255.0
gateway 172.22.221.1
dns-nameservers 172.22.2.32 4.2.2.2
auto eth1
iface eth1 inet static
address 172.22.221.30
netmask 255.255.255.0
gateway 172.22.221.1
dns-nameservers 172.22.2.32 4.2.2.2