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Date: Sun, 29 Apr 2007 21:28:38 +1000
From: Peter Jeremy <peterjeremy@optushome.com.au>
To: Jack Barnett <jackbarnett@gmail.com>
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Cc: freebsd-net@freebsd.org
Subject: Re: Firewall
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On 2007-Apr-28 07:08:18 -0500, Jack Barnett <jackbarnett@gmail.com> wrote:
>I plan on using NAT so both internal networks can get to the internets.
>
>In the FreeBSD documentation I see there are 3 firewalls, IPFIREWALL,
>IPFILTER and PF (BF?).   I just need to do basic filtering and just a few
>port forwards.  Nothing to fancy.  Which one would be recommended?

Basically any of them will do what you want.  The major differences are:
- IPFW (IPFIREWALL) is FreeBSD only.  Note that the NAT is in userland.
- IPfilter is the most portable.
- PF runs on *BSD.  Note that (AFAIK) all proxies (eg FTP) are in userland.

Userland NAT or proxies incur significantly higher overheads than
in-kernel equivalents (because the packets have to cross the
kernel/userland barrier twice).  This may be an issue if you have a
very fast Internet connection and an underpowered firewall.

--=20
Peter Jeremy

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