Comment # 10 on bug 1005478 from Knut Alejandro Anderssen Gonz�lez

BTW in the configuration you are using this options should also work

## /etc/sysconfig/network/routes
default 192.168.131.100 - - 

## /etc/sysconfig/network/ifroute-eth0
192.168.131.100 - - eth0
default 192.168.131.100 - eth0