ftp trouble

[S J]

I have vsftpd running on my computer behind a Dlink router.
Users seem to be able to login to the server just fine, but after the 
client goes into passive mode, it hangs and
doesnt show the directory listing.
This problem does NOT occur when I try to login to my server 
locally(192.168.0.100).
So I'm guessing its a router issue? Except, I've already opened up the 
ports 20 and 21 for ftp.
Any ideas on what I can do to make this work?

Thanks
~SJ
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