Thanks everybody for the insight. I have to admit that I know absolutly nothing about networking, so please bear with me (or take over if I'm too slow :). The gentoo wiki has good documentation <https://wiki.gentoo.org/wiki/Iproute2#iproute2_for_net-tools_swappers> on switching from ifconfig (net-tools) to ip (ip-route2),  so I'll start from there. 
------------------------------------------
9fans: 9fans
Permalink: https://9fans.topicbox.com/groups/9fans/T84b4492f91f2abb6-M679a44b019d5e172fe47ecd3
Delivery options: https://9fans.topicbox.com/groups/9fans/subscription