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Cisco Bug: CSCte50312 - IPNAT-4-ADDR_ALLOC_FAILURE due to NetBIOS traffic

Last Modified

Feb 03, 2017

Products (1)

  • Cisco 7200 Series Routers

Known Affected Releases

12.2(33)SRC5

Description (partial)

Symptom:
1) NetBIOS (UDP port 137) traffic from VRF passing NAT generates this error message every 2 minutes. IPNAT-4-ADDR_ALLOC_FAILURE due to NetBIOS traffic is seen, although NAT pool is not totally used.

2) The address allocated from the pool for first PAT translation is wrong. Instead of taking the first address allotted, it takes up the second address in the free pool. Then for the next subsequent free address allocation, it would need to have the third address. As there is no third address in the pool, it shows symptom 1.

Symptom 1 is normal behavior of showing, that the address pool is empty. Symptom 2 is a issue and it is fixed in this ddts, by making the first address of the pool reserved for PAT, so that the PAT would use only that address.


Conditions:
NetBIOS (UDP port 137) traffic from VRF passing NAT generates this error message every 2 minutes.
To get the issue easily, the address pool should have only 2 free addresses in the pool.
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