High UDP ports showing open on my systems

["Gabriel M. Beddingfield" <gabriel@teuton.org>]

Hi!

I've been running nmap scans on a couple of my debian systems, and I'm 
finding that one unpriviliged UDP port is always showing open, but the 
port changes with every scan.  Anybody know what's going on?  Here's a 
few tests (edited for brevity):

debian:~# nmap -sU -p 40000-65535 192.168.1.100
PORT      STATE SERVICE
52979/udp open  unknown
debian:~# nmap -sU -p 40000-65535 192.168.1.100
All 25536 scanned ports on 192.168.1.100 are: closed
debian:~# nmap -sU -p 40000-65535 192.168.1.100
PORT      STATE SERVICE
41252/udp open  unknown

lsof doesn't show any such port open.  The -sV switch doesn't give any 
extra info for these high ports.

Thanks,
Gabriel