WEll
the subnet mask we have for nic on en2 is 255.255.255.0
here is the ouput of ifconfig on en2(NIC on PCI slot)
en2: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::203:93ff:fef4:f654 prefixlen 64 scopeid 0x6
inet 172.30.1.100 netmask...