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Date:      Sat, 27 Apr 2002 18:42:49 -0700
From:      Danny Howard <dannyman@toldme.com>
To:        freebsd-questions@freebsd.org
Subject:   ipfw/natd redirect external IP to protected net?
Message-ID:  <20020427184249.B13388@pianosa.catch22.org>

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Home network: DSL subnet -> FreeBSD ipfw/natd -> 10.net

Now I have a netscreen box, a VPN box which is meant to sit on a public
address on the DSL subnet, in front of the firewall, and supply access
to the 10.net at work.

Unfortunately, it would be non-trivial for me to locate the Netscreen in
front of the firewall, so I'm trying to figure out if there is a way for
the firewall to provide access to its IP address as if it were not
behind the firewall.

I am already using -redirect_address so that the firewall can bind an IP
on the DSL subnet as an alias, and then redirect it to a machine on the
10.net.  This is sub-optimal even in the case where I can give out a
10.net address, because the machine can't find itself unless it also
aliases the public IP address. :/  THEN for some reason, other machines
on the protected 10.net can't reach that machine either! :(

And, in this case, the netscreen COULDN'T bind a 10.net address because
it's already tunneling a 10.net to us, and that's a paradox, I think.

ARGH!

Any ideas?  I think I have to crawl under the house with some CAT5 ...

-danny

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