I be no expert on this, but it seems that
someone who runs a gnutella servent has your
IP address in it's queue. This might happen if:

1) You ran a gnutella servent in the recent past.
2) You are on a dialup and someone who had your
IP address in the recent past was running a
gnutella servent...

I.E. Someone's gnutella thinks that you are running gnutella. Happens all the time to me.
I ignore it. A ping is not a Hack and a Hacker
is not a Cracker. (although a Cracker will ping
first to locate you.) If your machine has
it's doors closed & secure, you are safe.

If your doors are open, gnutella is the least
of your worries.........

cheers
jd