How to detect programmatically if my machine is behind a firewall

From: Swaroop Kumar (swaroop1967_at_yahoo.com)
Date: 03/05/04 

Date: 5 Mar 2004 09:37:21 -0800

Hello:

   Is it possible to programmatically (in Java, of course) detect if
my machine is running behind a firewall or a router? I would
appreciate any help/tips/pointers/advice that you can provide. A
potentially silly way would be to send an HTTP request to
http://www.whatsmyip.com and compare the IP address in the response to
the one that I think I have (maybe determined by creating a socket?).

Thanks in advance,
Swaroop

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