VM as a LAN router

[VSK]

Hi all.
What I'm trying to do is to configure a Linux guest in a subnet with a router and the host on another sub with the guest, completely isolated from the original router.
I create a VM with two bridged NIC's - one on a 10.0.0. and another one 10.0.1.
So far so good. I configure the host NIC at 10.0.1. and leave the Virtual Host-Only adapter with it's default settings (192.168.56.1).
For some reason the guest won't route traffic from the host. I'm able to ping host -> guest and guest -> host, but that's all. It might be an iptables problem, even though I've double and triple checked it look's OK.
Any ideas are highly appreciated, or if there is a thread related to such config, please give a link, because I couldn't find it.
Thanx!

[VSK]

It turned out to be an Iptables problem indeed. A weird one though.