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Cisco Bug: CSCte28869 - ACE 4710 -excessive SRC NAT port reuse

Last Modified

Jun 17, 2015

Products (1)

  • Cisco ACE 4700 Series Application Control Engine Appliances

Known Affected Releases

3.0(0)A3(2.4)

Description (partial)

Symptom:
 When ACE 4710 is performing load-balancing and utilizes NAT/PAT,  the ACE 4710 may reuse a source port quicker than the Rserver can clear it from its TIME-WAIT state.  The ACE will only use 4K random source ports out of the available 64K source ports and will cycle through the ports in 4 seconds.  

This issue can lead to the Rserver responding to a new SYN request with the wrong ACK/Seq number which would result in a connection termination. 

Conditions:
4710 is performing load-balancing and utilizes NAT/PAT
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