multicast broadcast out of Ubuntu 8.04?

[John Conover]

My network monitors are picking up:

    01:34:12.685869 IP mymachine.mydomain.com.5353 > 224.0.0.251.5353:  0 PTR? _pgpkey-hkp._tcp.local. (40)

from a new Ubuntu 8.04 machine.

What is it?

     Thanks,

     John

-- 

John Conover, conover at rahul.net, http://www.johncon.com/