[CentOS] default gateway outside of the LAN

Hi Boris,

> We have a somewhat unique setup whereby our default router is outside of
> the local network.

'unique' is a very mild expression. The word you're actually looking for was probably 'wrong'. 

Your gateway *must* be in the network your interfaces are in. You also would not want your living room be built without any doors and a sign on the wall 'the exit is in the kitchen'. 

Best regards, 

  Peter.