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Cisco Bug: CSCuo68909 - TCP flows modification (RFC 1122, Section 4.2.2.13)

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(19)

Description (partial)

Symptom:
The issue here is that UE is creating a new flow reusing same source port as before and the PGW deleting the existing flow.  If the TCP socket is closed gracefully via FIN/FIN_ACK, the TCP socket will go into a TIME_WAIT state.  After 20 seconds the flow will be deleted in the PGW, this is why the UE starts to retransmit after starting the new TCP socket.

Conditions:
UE sends TCP FIN to close the TCP socket, then re-establishes the TCP socket with the same src ip, src port, dest ip and dest port.

The ASR will delete the TCP flow and then the UE has to re-open the TCP socket again.
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