Date: Thu, 16 Jul 1998 15:22:44 +0300 From: Ruslan Ermilov <ru@ucb.crimea.ua> To: Thomas David Rivers <rivers@dignus.com>, freebsd-hackers@freefall.cdrom.com Subject: Re: ipfw rules for exposing an internal machine's port externally? Message-ID: <19980716152244.A22669@ucb.crimea.ua> In-Reply-To: <199807161205.IAA01215@lakes.dignus.com>; from Thomas David Rivers on Thu, Jul 16, 1998 at 08:05:13AM -0400 References: <199807161205.IAA01215@lakes.dignus.com>
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On Thu, Jul 16, 1998 at 08:05:13AM -0400, Thomas David Rivers wrote: > > I thought I should be able to do this; but it doesn't > seem to work well. Perhaps someone knows what I've got wrong here. > > What I have is a machine "X" which is on the external network > and through which I divert all internal traffic on the 10.0.0.x > network via ipfw/natd, as in: > > ipfw add 100 divert 32000 ip from any to any via sl0 > > > However, I have an internal machine (10.0.0.10) that's set up > to do telnet connections on a different port (e.g. port #PPPP in > the following example.) > > I would like to make those connections available externally. > > So - I've got added: > > ipfw add 50 pass log tcp from any PPPP to 10.0.0.10 PPPP > ipfw add 50 pass log udp from any PPPP to 10.0.0.10 PPPP > > But, if I telnet to the gateway machine at port PPPP as in: > telnet gateway PPPP > all I get is: > Trying x.x.x.x... > telnet: Unable to connect to remote host: Connection refused > > > If I, however, telnet on the internal network to 10.0.0.10 PPPP > I get connected just fine. > > > > Has anyone done this before? That is, map a particular port number > on one machine to a different one? And, use that with divert to > make a service on an internal machine externally visible? If so, how? > You're missing redirect natd rule, it seems to me. Add the following line in natd config file on "X": redirect_port tcp 10.0.0.10:PPPP PPPP This will tell natd to redirect X:PPPP connection to 10.0.0.10:PPPP. HTH and regards, -- Ruslan Ermilov Sysadmin and DBA of the ru@ucb.crimea.ua United Commercial Bank +380.652.247.647 Simferopol, Ukraine http://www.FreeBSD.org The Power To Serve http://www.oracle.com Enabling The Information Age To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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