Date: 13 May 2003 22:34:40 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.no-ip.com> To: Niklas Saers Mailinglistaccount <niklasmls@doriath.saers.com> Cc: questions@freebsd.org Subject: Re: SSH nat-forwarded Message-ID: <44addqi7cv.fsf@be-well.ilk.org> In-Reply-To: <20030512124842.F32710@doriath.saers.com> References: <20030512124842.F32710@doriath.saers.com>
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Niklas Saers Mailinglistaccount <niklasmls@doriath.saers.com> writes: > Hi, > I've got a firewall that forwards ports to SSH-ports on boxes it protects. > This has been good for all 4-STABLE boxes, but I've recently put up a > CURRENT box. I can SSH to the firewall and from the firewall to the > CURRENT box, but I do not get a proper connection when having it forwarded > through the firewall. > > Let's say my external box 'ext' is on 193.1.2.3, my firewall 'fw' is on > 193.2.2.1 and my internal CURRENT-box on 192.168.5.1 > > 'fw' masquerades using > "/sbin/natd -interface fxp0 -redirect_port 192.168.5.1:22 5051" > > and "firewall": > ipfw add divert 8668 ip from any to any via fxp0 > ipfw add allow ip from any to any > > from 'fw' "telnet 192.168.5.1 22" gives the classic "SSH-1.99"-etc > while from 'ext' "telnet 192.2.2.1 5051" gives no greeting at all. It > listens and terminates the connection after a short while. > > Any suggestions to why ssh doesn't connect correctly? I've forwarded other > ports to other services on the same box and it works flawlessly. Thus I > suspect that 'sshd' understands I've forwarded this connection and doesn't > like it the least bit. Can I turn of this hypersensitivity? Actually, it sounds more like the packets are getting dropped inside somewhere. Check the traffic on the inside link to see. [Are you sure you can do without the "tcp" specifier right after the "-redirect_port" option?]
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