Well.... making Static IP connections in Linux, is some difficult because the system turns DHCP attibution of the dynamic IPs, the preferential process!
if you set staic IP, this turned dynamic automatic...
Please try this...
I have in mind that you have the default networkmanager or GNOME net daemon, auto etho enabled, the nomal sabayon conection
make this:
1) use "sudo net-setup" command, and for a while, make the provisory net connection, use your static ips, you gateway, youDNS servers... you will connect....
2) Whithout reboot the comp, you may open sulfur and REMOVE all the networkmanagers: networkmanager, knetworkmanager, nm-net applet, auto eth0 packages etc... etc... after, you need to REMOVE ALL the DHCP support, the DHCP in your system, should be null, totally removed!
3) then, you cam install ONLY ONE network client WICD, but without DHCP Deps....! the use WICD configurated fo STATIC IP, your gateway, you DNS servers etc... etc...
the only HOW-TO that a know is in Italian language: but the commands, links etc are the sama that you will use.i have in mind that you may read using google translator, if you do not read Italian language...:
see the link in:
http://www.sabayonmania-forum.com/sabayonlinux-problemi-generali-f15/configurare-ip-statico-t4335.htmand cited links.
in the moment that write this Sabayon Mania Forum is outline!