interface permissions
 

How do i give normal users access to configure my ethernet interfaces such as "eth0"?
I'm running debian etch linux.

Why would you even want to do that? Do you want your normal users to mess up your network config?

Anyways, you could set the setUID permission bit on the (root owned) programs that allow you to configure network and/or on the files with network configs, like /etc/sysconfig/network*/*. Haven't tried it.

But again, I need to stress that this has serious security implications.