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Cisco Bug: CSCsg30779 - Dynamic NAT with reversible can not create new entry

Last Modified

Feb 22, 2014

Products (1)

  • Cisco IOS

Known Affected Releases

12.4(10)

Description (partial)

Symptom:
When using dynamic Network Address Translation(NAT) with
"reversible" keyword, new NAT entries can not be created.

Condition:

 - It occurs when using "reversible" keyword.

 - A new NAT entry is not suddenly created. The existing
   entries which have already been created, are not affected.

 - It may occur after a number of NAT entries are created
   by traffic flow which goes through from outside to inside.

 - When this problem occurs, the "misses" counter increase
    in "show ip nat statistics".

 - You can observe that the following debug message is output
   when using "debug ip nat detailed"

     "NAT: failed to allocate address for XX.XX.XX.XX"

 - The NAT entry does not depend on TCP/UDP.

 - It does not depend on a type of interface and platform.
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