Firewall for VoIP box

Dmitry Mishchenko ledda at
Fri Oct 31 03:40:23 PST 2003


We have the following configuration: FreeBSD router with 2 network cards.
- first card has a real IP and connected to internet (lets say There is a  ipfw firewall which control traffic to this card.
- second card has another real IP (lets say and connected to 
Quintum VoIP box.

VoIP box has also its own real IP (lets say

How should firewall be configured for card #2 for allowing VoIP traffic?
What ports should be open for normal VoIP work?


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