From owner-freebsd-net  Thu Dec 27  1:40:26 2001
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Date: Thu, 27 Dec 2001 01:32:39 -0800 (PST)
From: Julian Elischer <julian@elischer.org>
To: "Crist J . Clark" <cjc@FreeBSD.ORG>
Cc: Henry Su <henrysu@nttmcl.com>, freebsd-net@FreeBSD.ORG
Subject: Re: socket call in the kernel
In-Reply-To: <20011227012855.F2090@blossom.cjclark.org>
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yes, but there is no need to 
change the packet..
fwd will do exactly what he wants as soon as I can get the 
network topology worked out :-)

On Thu, 27 Dec 2001, Crist J . Clark wrote:

> On Thu, Dec 27, 2001 at 01:04:25AM -0800, Henry Su wrote:
> > Yes, it works:
> > 
> > [00:52:58][root@test2:~]$ telnet 127.0.0.1 8800
> > Trying 127.0.0.1...
> > Connected to localhost.
> > Escape character is '^]'.
> > 12334
> > 
> > HTTP/1.1 302 Moved
> > Date: Thu, 27 Dec 2001 00:53:18  PST
> > Location: https://216.69.69.254/cgi-bin/login
> > 0
> > 
> > 
> > Connection closed by foreign host.
> > 
> > 
> > I found the problem is that the ipfw forwarding does not change the dst ip
> > address, so that my redirection socket server can not read these
> > fwd packet (since the dst ip is not correct). The solution can be change
> > the ip_fw.c to modify dst ip address for the forwarding packet, but I do
> > not know how to do it. It has next_hop for fwd. I do not know how to do
> > packet manupunation in ip_fw.c's chk func.
> 
> That's what I figured your problem was, but I never got around to
> asking for you to check it.
> 
> 'fwd' rules _deliberately_ do not actually modify any data in the
> packet. You are looking for something more like NAT. natd(8) may be
> overkill for your needs. There are other, more lightweight TCP
> forwarders in the ports collection.
> -- 
> "It's always funny until someone gets hurt. Then it's hilarious."
> 
> Crist J. Clark                     |     cjclark@alum.mit.edu
>                                    |     cjclark@jhu.edu
> http://people.freebsd.org/~cjc/    |     cjc@freebsd.org
> 


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