11.04 Semi-Headless Server + Apple AirPort = Internal Connection, External?

[keenanv]

Long story short I have an Ubuntu server 11.04 installation with SSH, FTP, VNC (+fluxbox), and Deluge w/ WebUI and it works perfectly on the internal network, but not on the web. I've tried Port Mapping with the AirPort, but I'm using the Windows version of the application and it doesn't seem to work.

Here's some more info, because I'm a linux nub:

tcp        0      0 0.0.0.0:63580           0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:58846         0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:8112            0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:6001            0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:21              0.0.0.0:*               LISTEN
tcp        0      0 0.0.0.0:59001           0.0.0.0:*               LISTEN
tcp6       0      0 :::63580                :::*                    LISTEN
tcp6       0      0 :::5901                 :::*                    LISTEN
tcp6       0      0 :::59001                :::*                    LISTEN

[jmoorse]

Looks like this is an issue with the Airport if you cannot get the ports forwarded, looks like you need to get that straightened out first.

Also, some ISPs filter certain ports (like FTP, WWW, etc) on residential connections.

[keenanv]

Looks like this is an issue with the Airport if you cannot get the ports forwarded, looks like you need to get that straightened out first.

Also, some ISPs filter certain ports (like FTP, WWW, etc) on residential connections.

Is there any way to test to make sure that ubuntu isn't at fault? (with no physical access to the Apple AirPort)

[jmoorse]

Yes.

1. Grab your WAN IP from the external client (www.ipchicken.com)
2. Fire up tcpdump and sniff the traffic on the ubuntu box. Eg: sudo tcpdump -i eth0 host [WAN IP from step1] -vvv -s0
3. Try to connect to the ports externally from machine used in step 1

If you see requests come in then there is something else going on here