Network sharing without using NAT, possible?

[Mateus Interciso]

Hi all, I currently using iptables NAT for routing the internet trough 2 
different sub-networks, and we are having some trouble with the NAT, 
specially for VoIP, so I was thinking if it's possible  to make a router 
(like a CISCO IOS) using Zebra, that will, in other words, share the 
Internet trough the sub-networks, without using NAT, or in a better way.
The question for this, is that we had a w2k3 server sharing the internet, 
and the VoIP was fine, since we changed the w2k3 for a Linux Box, the VoIP 
started acting very strangely, and I'm really running out of options here 
to make it fix, I though about this, is it possible?

Thanks a lot.

Zarnick

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