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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 :)) ?

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2  
You watched too many movies. :P – Shiki May 13 '10 at 12:46
    
Maybe you're right :) – asksuperuser May 13 '10 at 16:57
up vote 4 down vote accepted

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

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Interesting. I didn't know that DropBox had this peer-to-peer sync capability – rupello May 13 '10 at 12:43
    
Dropbox do that :) @rupello: me too – nXqd May 13 '10 at 14:30
    
Yes It's probably my Dropbox ! – asksuperuser May 13 '10 at 16:58
    
But what about port 56712 ? – asksuperuser May 13 '10 at 17:01

If you do have dropbox this link shows how to turn that off if that is what you want

DropBox Forum

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