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Cisco Bug: CSCur35064 - IOS XE PAT uses non-overloaded NAT for protocols that can't be PAT-ed

Last Modified

Nov 27, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

15.4(3)S

Description (partial)

Symptoms:  
When the NAT overload keyword is used, IOS XE will use
Port Address Translation (PAT) for protocols that contain information 
that permits the PAT to be done.

Packets to be translated that belong to prototols that  can NOT be 
translated using PAT will be translated using 
non-overloaded NAT (Regular NAT) and will subsequently consume a full IP address from the
NAT translation. The size of the NAT pool should be considered if it is desirable to
translate those protocols that can not use PAT.

Conditions: 

Packets for protocols that are NOT in the following list can NOT be PAT:

- TCP
- UDP
- ICMP
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  • Status
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