problem with interfaces

[Ezequiel Reyes Aragon <ezequiel%ecaribe.co.cu@localhost>]

Hi list,
I have some NetBSD created in a virtual network with ip: 10.0.0.0/24 and 
most of them have 10.0.0.2 (another NetBSD virtual pc) defined as a 
gateway. This last pc as two interfaces declared, one with 10.0.0.2 for 
the internal network it is on, and one with the ip: 192.168.100.9 
bridged to the real interface on the host machine. From this netbsd 
gateway I can ping any real machine in the 192.168.100.0/24 network, as 
well as any machine in the virtual network, but I can not ping real 
machines from any other NetBSD virtual pc that use it as their gateway. 
I used sysctl in the virtual gateway machine to set ip forwarding = 1.
Is there something else that needs to be done?
My intend is to have a virtual network with only netbsd pcs, using one 
of them as a gateway to the real world via an additional interface in 
bridge mode.
thanks