loop back in a system with two network cards

shabnam · 12-29-2012, 08:24 AM

Hello
We have a system which has two network cards, we set two ip addresses on these cards, and we want to set a loop back ip address on these network cards, we want to know if it is possible to do this? and if it is possible how can we do it?we use the following command but it seems that it doesn't work.

ip -4 addr add loopback_address/32 scope host dev lo

Thanks

pan64 · 12-29-2012, 09:02 AM

as far as I know the loopback device looks like an interface, with the ip 127.0.0.1. So in your case you will have 3 devices. The loopback device is used to make local connections, and there will be no real network traffic (on any real interfaces).
So you cannot set loopback address on a real network cards I think. Why do you need it? What do you want to achieve at all?