Continuing with Add second IP Ubuntu” Now let’s see how to do it on Arch Linux.

First edit the file rc.conf (I like the way Arch Linux is so simple).

You have these options: Two Statics IPs

eth0="eth0 netmask broadcast"
eth0_0="eth0:0 netmask broadcast"
INTERFACES=(lo eth0 eth0_0)

In the routes section include something like this

gateway="default gw"

One static and dynamic IP

I have made this, I do not know if it correct, but works for me, I need one IP from the DHCP, and one static IP

eth0_0="eth0:0 200.87.61.XX netmask broadcast 200.87.61.XX"
INTERFACES=(eth0 eth0_0)