I'm fairly new to Linux as my question will probably reveal. I have a single ethernet port on desktop and am running Fedora Core 4. I've configured the single ethernet port with a subinterface and have assigned that subinterface with an IP address. The eth0 interface has IP address 172.16.22.1 and the eth0:1 interface has 192.168.22.1. There should be no problem routing between these two correct?


I want to find out if routing between two networks on the same ethenet interface is possible but have not figured out how to do it. I thought enabling IP forwarding would do the trick. My routing table contains both networks, but it still doesn't work. Any ideas?

I am not sure if it is possible either...

But does it have the two hosts?
Can you show output of 'route'?

Not sure if one can use ip forwarding on Alias IP's like you setup. I know the IPtables does not understand eth0:1. So one must use the IP address and not use the reference of eth0:1 in thier iptable scripts.

One thought is on the eth0:1 network is not to assign a gateway. Just define the IP and subnet. This is the way I setup 2 or more nics in a machine. The first nic has IP, Subnet, Gateway, DNS defined. Second and others are just IP and Subnet. Let IP forward define the routing from there.

Brian1