Simple IPTables Question.

bzyk · 04-18-2008, 01:52 AM

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 192.168.1.203 --> 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)

trryhend · 04-18-2008, 09:10 AM

Quote:

Originally Posted by Curtix

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?
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Yes, your ISP could be blocking it. Have someone attempt a telnet session from outside and monitor tcpdump on your router.

Curtix · 04-18-2008, 09:20 AM

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(192.168.1.190)I am on can telnet to 192.168.1.202 already. Thanks.
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