Difference between ipf/ipfw and ipnat/natd

Han Hwei Woo hhwoo at argosy.ca
Fri Jun 27 07:04:31 PDT 2003

----- Original Message ----- 
From: "Andreas Dahlén" <andreas.dahlen at nbit.sigma.se>
To: <freebsd-questions at freebsd.org>
Sent: Thursday, June 26, 2003 6:03 AM
Subject: Difference between ipf/ipfw and ipnat/natd

> Hello!
> I'm going to install FreeBSD 4.8 as a firewall/gateway for my homenetwork.
> I've seen that there are two implementations of firewalls in FreeBSD;
> ipf and ipfw and fot NAT ipnat/natd.
> As I understand ipf and ipnat works together and ipfw and natd. Is that
> correct?
Yes, that is correct.

> Which one of them should I use?
> Is there some major differences between them?
ipfw is a part of FreeBSD, whereas ipfilter is written by Darren Reed and
runs not only on FreeBSD, but also on OpenBSD, NetBSD, Solaris (and perhaps
others?) if I recall correctly. If you plan to take advantage of the builtin
rc scripts to run a predefined set of firewall rules, you'll probably want
to stick with ipfw/natd.

Also, just fyi ipfw is fairly conventional: the first firewall rule that
matches will apply whereas with ipfilter, the last matching rule will apply
unless you specify "quick".

> /Andreas
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