[TriLUG] Tomato Firmware vs. FTP server

[Lance A. Brown]

Greetings,

I'm trying to experiment with an FTP service on my server at home behind
a Linksys WRTG54G running Tomato Firmware.  Logging in works fine, but
the switch to PASV mode to list the current directory fails.  Tcpdump on
the server reveals:

20:12:35.926895 IP X.X.X.X.13361 > 192.168.1.20.60027: S
2164785465:2164785465(0) win 65535 <mss 1414,nop,wscale 2,nop,nop,sackOK>
20:12:35.926927 IP 192.168.1.20 > X.X.X.X: ICMP host 192.168.1.20
unreachable - admin prohibited, length 60

which leads me to believe the FTP port detection for the NATing on the
router is failing.  I've been through the settings on the router and it
appears everything is set properly, but what do I know.

Anyone seen this before?  Got any clues?

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