I have CentOS 4 running on an old (early model) p3 with 64 MB RAM. It is acting as a router and firewall for my LAN. CentOS is doing a really good job with Shorewall + DHCPd - on a 10 Mbps cable modem, I see ~ 9.7 Mbps of throughput even when numerous tcp streams to different LAN hosts are running. I would like to add a virtual interface to one of my LAN interfaces. My LAN interface (/etc/sysconfig/network-scripts/ifcfg-eth2) looks like: DEVICE=eth2 BOOTPROTO=static BROADCAST=192.168.10.255 HWADDR=00:60:08:C3:F9:71 IPADDR=192.168.10.1 NETMASK=255.255.255.0 NETWORK=192.168.10.0 ONBOOT=yes TYPE=Ethernet would adding the below: /etc/sysconfig/network-scripts/ifcfg-eth2:0 DEVICE=eth2:0 BOOTPROTO=static BROADCAST=192.168.20.255 HWADDR=00:60:08:C3:F9:71 IPADDR=192.168.20.1 NETMASK=255.255.255.0 NETWORK=192.168.20.0 ONBOOT=yes TYPE=Ethernet Would this create a virtual interface eth0:0 with the IP address 192.168.20.1? Thanks in advance.