How do I get netcat to accept connections from outside the LAN?

Posted by Chris on Server Fault See other posts from Server Fault or by Chris
Published on 2010-03-31T12:14:46Z Indexed on 2010/03/31 12:23 UTC
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I'm using netcat as a backend to shovel data back and forth for a program I'm making. I tested my program on the local network, and once it worked I thought it would be a matter of simply forwarding a port from my router to have my program work over the internet. Alas! This seems not to be the case.

If I start netcat listening on port 6666 with:

nc -vv -l -p 6666,

then go to 127.0.0.1:6666 in a browser, as expected I see a HTTP GET request come through netcat (and my browser sits waiting in vain). If I go to my.external.ip.address:6666, however, nothing comes through at all and the browser displays 'could not connect to my.external.ip.address:6666'.

I know that the port is correctly forwarded, as www.canyouseeme.org says port 6666 is open (and when netcat is not listening, that its closed).

If I run netcat with -g my.adslmodem's.local.address to set the gateway address, I get the same behavior. Am I using this command line option correctly? Any insight as to what I'm doing wrong?

How do I get netcat to accept connections from outside the LAN?

Posted by Chris on Stack Overflow See other posts from Stack Overflow or by Chris
Published on 2010-03-31T11:43:31Z Indexed on 2010/03/31 12:33 UTC
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netcat

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gateway

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