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Why does a router send ack rst packets ?

we see our router sending thise packets:

*Oct 28 13:37:13.161 MET: IP: s=127.0.0.1 (Serial0/0), d=192.168.77.167 (Serial0/1.2), g=192.168.14.

9, len 40, forward

*Oct 28 13:37:13.161 MET: TCP src=80, dst=1466, seq=0, ack=1199702017, win=0 ACK RST

*Oct 28 13:37:13.945 MET: IP: s=127.0.0.1 (Serial0/0), d=192.168.78.199 (Serial0/1.1), g=192.168.14.

17, len 40, forward

*Oct 28 13:37:13.945 MET: TCP src=80, dst=1984, seq=0, ack=855900161, win=0 ACK RST

*Oct 28 13:37:14.805 MET: IP: s=127.0.0.1 (Serial0/0), d=192.168.78.232 (Serial0/1.1), g=192.168.14.

17, len 40, forward

*Oct 28 13:37:14.805 MET: TCP src=80, dst=1734, seq=0, ack=512163841, win=0 ACK RST

*Oct 28 13:37:17.861 MET: IP: s=127.0.0.1 (Serial0/0), d=192.168.14.17 (Serial0/1.1), g=192.168.14.1

7, len 40, forward

*Oct 28 13:37:17.865 MET: TCP src=80, dst=1092, seq=0, ack=56688641, win=0 ACK RSTundeb all

All possible debugging has been turned off

Does anybody know how that could happen?

source port is 80 always, source is 127.0.0.1??

We have no idea!

Thanks

Ralf

1 REPLY
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Re: Why does a router send ack rst packets ?

I've seen that the PIX sometimes denies the last packet in a TCP connection and sends a TCP RST. This happens intermittently, but may be related to amount of data transferred during the connection (it seems to occur when there is little data transferred).

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