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cisco 800 series with a dlink router behind

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Aug 23rd, 2007
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i have a cisco router series 800 (, it receives the DSL connection to internet, it have attached a wireless router d-link, with a Linux-Server I want to redirect port 23(telnet) to, but i can?t do it,, when i make a telnet to public internet IP, the cisco (, answers me... I don?t want this, i want (linux server) answer me... somebody can help me? thanks a lot??

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a.cruea1980 Thu, 08/23/2007 - 09:10
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Did you set up the NAT properly for this?

Also, you'll need to let your router know that you're not wanting it to listen on port 23 on the external interface. I believe you do this with an ip telnet source-interface command.

agcornejo Thu, 08/23/2007 - 09:31
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well, i did this: log in the router web interface, Configuration-Forwardin ports... and i put that: port TCP and UDP pointin to (first).. and problem was not solved... in second attempt, i login into the dlink wireless router ( and redirect port 23 to, in this same attempt, i say the cisco forward port 23 (telnet) to but problem persists... sorry if the question is a lot basic, i don't have experience with cisco routers...

a.cruea1980 Thu, 08/23/2007 - 09:49
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I don't know how to do it in SDM, but on a command line, you'd just put in:

ip nat inside source static tcp (dlinkrouterwanip) 23 interface (waninterface) 23

You need to forward off port 23 to the DLink router. . .then from the DLink, forward it off to the server.

senglobe0907 Thu, 08/23/2007 - 09:18
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Create a static NAT entry in the router with in-side config.IN statifc NAT give the IP other than any of our interface IP (like and NAT to linux server IP address. This should solve your problem.




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