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Flooding TCP connection

From: "Atte Peltomaki" <koston@xxxxxx>
Date: Mon, 21 Mar 2005 18:53:17 +0200

Every once in a while, when application crashes and leaves an open TCP
connection, data starts flowing full speed back and forth the boxes.
Here's tcpdump output from one occasion where Opera crashed:

=06:56:33.123424 IP webserverip.80 > myboxip.1632: . ack 1 win 33580 <nop,nop,timestamp 859 139667162>
06:56:33.123461 IP myboxip.1632 > webserverip.80: F 838440838:838440838(0) ack 3219133104 win 65535 <nop,nop,timest

netstat says the connection is in CLOSE_WAIT state. 

I have a Dell Precision 420 workstation (dual P3 800) with an integrated

xl0: <3Com 3c905C-TX Fast Etherlink XL> port 0xdc80-0xdcff mem
0xf8fffc00-0xf8fffc7f irq 16 at device 4.0 on pci2

I'm using packet filter with a basic workstation ruleset.

Any clues? Let me know if you need more information.

Atte Peltomäki             

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