natd with several alias IPs

bob at bob at
Wed Feb 15 15:40:54 PST 2006

I am not sure just what you are asking about.

Are you saying that you have 4 static public ip address assigned to
you by your ISP and you want to round robin those 4 in the NATing
process to your hundreds of LAN users?

If that's what you are after then any of FreeBSD's 3 built in
firewall can do that by how you code the NAT statements.  Read the
handbook firewall ipfilter section for details. There is no special
tricks or need for several NATed process.

-----Original Message-----
From: owner-freebsd-questions at
[mailto:owner-freebsd-questions at]On Behalf Of Andrew
Sent: Wednesday, February 15, 2006 3:45 PM
To: FreeBSD Questions
Subject: natd with several alias IPs

I wonder, what tricks do you use to use more than
one alias IP? I mean, if you have hundreds of
hosts behind your firewall, what can you do to alias
some of them to one ip, others to another and so on.

I know pf can probably do it in a better fashion, I just
wonder how we can do it with natd. Several natd
processes? Some other tricks?
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