nat question

fbsd fbsd at
Tue Jun 20 00:11:10 UTC 2006

There is no way your ISP can cut out NATted traffic.

You would be better off following the handbook firewall section.

-----Original Message-----
From: owner-freebsd-questions at
[mailto:owner-freebsd-questions at]On Behalf Of Vlad GURDIGA
Sent: Monday, June 19, 2006 7:16 PM
To: freebsd-questions at
Subject: nat question


I could not figureout the answer to a question. Here is the situation:

PC A: Windows XP Pro.
PC B: FreeBSD 6.1, connected to internet, acting as a gateway for PC
A, with NAT (built by hanbook instructions,
open firewall, no restrictions.

For long time I have used the PC A with PC B as gateway and everything
worked just fine, but now PC A can only ping any host (by IP) in
Internet. No other traffic (DNS queries, FTP or HTTP) does not reach
the Internet comming back with TTL exceeded response apparently from
de destination host (I've seen this on PC B with Ethereal).

Question: Is there any way my ISP can 'see' and cut out NATted traffic
from PC A letting only the traffic from PC B pass?! How?!
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