Date: Mon, 16 Apr 2001 08:50:01 -0700 (PDT) From: James Howard <howardjp@well.com> To: freebsd-questions@freebsd.org Subject: NAT with FreeBSD Message-ID: <Pine.GSO.4.21.0104160849220.22248-100000@well.com>
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I am trying to set up a FreeBSD NAT firewall.
The external interface (fxp0) has an IP address of 172.25.21.20 (don't
ask). The internal (sis0) is 10.1.1.1. I have a PC behind it that is
10.1.1.10. The NAT and all that works fine with these rules:
00100 328030 140010702 divert 8668 ip from any to any via fxp0
00200 578062 181527330 allow ip from any to any
65535 534 67432 deny ip from any to any
Now here is the trick. I want 172.25.21.21:25 to magically appear on
10.1.1.10:25. All the documentation I have seen on this says I should
have the firewall listening to 172.25.21.21:25 and proxy through, but this
changes the source address on the final receiver. But I know this can be
done without modifiying the source address since I have done this with
Netscreens. But I do not know how with FreeBSD. Can someone whack me
with a clue stick?
Jamie
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