What does this UDP Packet mean?

Question

I'm total newbie at tcp/ip and I was experimenting with Wireshark.

What this mean:

1824    578.194204  xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500  Destination port: 17500

In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?

Update I have another one which is port 56712 and yyy.yyy.yyy.yyy is the ip of someone with the same provider as me. Isn't this weird (OK I'm paranoïd :)) ?

Solution

Do you use Dropbox or similar software? Apparently the port you listed is used by Dropbox...

http://isc.sans.org/port.html?port=17500

Edit: Looks like it could be someone elses machine with Dropbox installed looking for "Lansync Compatible clients" http://forums.dropbox.com/topic.php?id=16253

Comments

[Apache]

You watched too many movies. :P

[Admin]

Maybe you're right :)

[rupello]

Interesting. I didn't know that DropBox had this peer-to-peer sync capability

[Dzung Nguyen]

Dropbox do that :) @rupello: me too

[M. Hasnat Raza]

Yes It's probably my Dropbox !

[M. Hasnat Raza]

But what about port 56712 ?