Date: Fri, 05 Nov 2004 10:08:40 +0900 From: Saber Zrelli <zrelli@jaist.ac.jp> Cc: freebsd-net@freebsd.org Subject: Re: Simple port forwarding question Message-ID: <418AD298.4090401@jaist.ac.jp> In-Reply-To: <41892D72.10203@elischer.org> References: <20041103003630.GA51913@mind.net><20041103011615.GA68454@falcon. midgard.homeip.net> <41892D72.10203@elischer.org>
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Julian Elischer wrote: > > > 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). > > >> >> You may also try using ssh port forwarding ; Smple command : ssh2 -L 1234:localhost:23 username@host all traffic coming to port 1234 on the client will be forwarded to port 23 on the server (|host|). Note that |localhost| will be resolved by the sshdserver after the connection is established. In this case |localhost| therefore refers to the server (|host|) itself. >> >> >> >> > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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