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Date:      Mon, 13 Jan 1997 16:18:34 -0600 (CST)
From:      Mark Tinguely <tinguely@plains.nodak.edu>
To:        avalon@coombs.anu.edu.au
Cc:        brian@awfulhak.demon.co.uk, chris@mail.bb.cc.wa.us, hackers@FreeBSD.org
Subject:   Re: IPFILTER
Message-ID:  <199701132218.QAA13145@plains.nodak.edu>

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>  ICMP is now (but it doesn't rewrite the headers in error packets).

good.

>  > Also, to get a successful remapping for IP application, be sure that you
>  > turned on the IP forwarding on the NAT host (ie:
>  >  
>  >  sysctl -w net.inet.ip.forwarding=1
>  >  
>  > ).
>  
>  even better, for things like ftp which have address data in the TCP stream,
>  use a proxy.

net.inet.ip.forwarding tells FreeBSD it is a IP router and that it should
forward packets from one interface to another. NAT translates the IP packet
but FreeBSD will eat the translate packet unless told to forward it.

--mark.



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