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Old 04-14-2004, 12:36 PM   #1 (permalink)
Silvy
paranoid
 
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Location: The Netherlands
Am I being hacked/ DOS-ed, whatever?

Probably not,

as I'm still able to post this, and it shouldn't take much to hang /overload my system and especially my connection.

But I am getting terrible connections to many servers, so I thought I'd check it out.

I used `tcpdump -ipp0` to read my internet traffic and I believe I keep getting 3 packet handshakes or something. For example:
Quote:
22:18:19.032975 81.134.108.43.20500 > my-ip.1439: P 130706573:130706575(2) ack 154129622 win 16295 (DF)
22:18:19.041633 81.134.108.43.20500 > my-ip.1439: P 2:147(145) ack 1 win 16295 (DF)
22:18:19.041908 my-ip.1439 > 81.134.108.43.20500: . ack 147 win 64089 (DF)

22:18:19.127558 81.134.108.43.20500 > my-ip.1439: P 147:149(2) ack 1 win 16295 (DF)
22:18:19.132455 81.134.108.43.20500 > my-ip.1439: P 149:262(113) ack 1 win 16295 (DF)
22:18:19.132716 my-ip.1439 > 81.134.108.43.20500: . ack 262 win 63974 (DF)
(grouped as I think it should be)

Now am I right in assuming that the connections are grouped as: 2 partial packets (i.e. containing something that should be considered as a single payload) sent from the remote machine, and a single response from my machine? Or is it the other way around (in which case I must now check for spyware stuff)

What activity is going on here? I see these packets come by sometimes 3 times every 2 seconds, sometimes 10/sec. I was trying to play a game online, but I think this is messing it up.

Anyone know how I should deal with this? The IP is assigned to a broadband ISP in the UK (I live in the Netherlands), and abuse mails don't give much response. Will simply blocking the remote address help?
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