Date: Wed, 03 Nov 2004 11:11:46 -0800 From: Julian Elischer <julian@elischer.org> To: Erik Trulsson <ertr1013@student.uu.se> Cc: John Fox <readbsd@mind.net> Subject: Re: Simple port forwarding question Message-ID: <41892D72.10203@elischer.org> In-Reply-To: <20041103011615.GA68454@falcon.midgard.homeip.net> References: <20041103003630.GA51913@mind.net> <20041103011615.GA68454@falcon.midgard.homeip.net>
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Erik Trulsson wrote: >On Tue, Nov 02, 2004 at 04:36:30PM -0800, John Fox wrote: > > >>Hi, folks. >> >>I'm experimenting, trying to setup a situation where connections >>to port 25 on machine A are forwarded to port 25 on machine B. >>I've read the ipfw manpage and it looks as though what I'm doing >>is correct. >> >> >>The IPFW rules on machine A are: >> 00100 fwd machineB tcp from any to any 25 >> 65535 allow ip from any to any >> >>And there is a sendmail listening on B's port 25. >> >>But when I telnet to machine A's port 25, all I get is >>a perpetual "Trying" message that just sits there. >> >> > >Don't use "fwd" for this - it doesn't work that way (for one thing B is >unlikely to handle an IP-packet that is still adressed to A.) > >Use natd and the '-redirect_port' option to natd instead - that works. > you can use ipfw fwd IF you also run it on the target machine to "capture/accept" the foreign packet. Otherwise teh packet will be forwarded back to it's stated destination (or dropped). > > > > > >
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