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

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases


Description (partial)

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.

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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