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Linux - Networking This forum is for any issue related to networks or networking.
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Old 04-18-2008, 01:52 AM   #16
Registered: Jun 2007
Location: Poland
Distribution: Debian, Slackware
Posts: 42

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Hmm.. in my knowledge this should work. Telling you about tcpdump I'm trying to find where's problem. tcpudmp show you if any packets from telnet going back to router (from --> router). With tcpudmp you can state precisely problem. You must know, where exactly packtets are lost.. Are they returning back from telnet to router? Or no? Or maybe they return but not go out from router to internet... Watch it with tcpdump.
Ah... your /proc/sys/net/ipv4/ip_forward is set to 1? (cat /proc/sys/net/ipv4/ip_forward)
Old 04-18-2008, 09:10 AM   #17
LQ Newbie
Registered: Oct 2007
Posts: 29

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Originally Posted by Curtix View Post
This is what I have ATM and it does not work.
could there be something besides the firewall that would block all inbound telnet connections on the firewall computer?
Yes, your ISP could be blocking it. Have someone attempt a telnet session from outside and monitor tcpdump on your router.
Old 04-18-2008, 09:20 AM   #18
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Registered: Apr 2008
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This server already getting telnet requests successfully and inside the LAN it accepts. This server is multihomed and has a 3 NICs with 3 IPS. One is on the want and two on the lan. I can telnet to each interface no problem.
I need to get rid of the wan interface and I am trying to simply pass the 23 requests through my firewall to the lan interface. This workstaion( am on can telnet to already. Thanks.

Last edited by Curtix; 04-21-2008 at 07:25 AM.


forward, iptables, port, telnet

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