Cisco Bug: CSCur77743 - ICMP packets generated by the router are wrongly NATted
Feb 16, 2018
- Cisco ASR 1000 Series Aggregation Services Routers
Known Affected Releases
Symptom: The clients don't receive ICMP message for the packets dropped by the router NATting the traffic. This breaks a few things like PMTUD. The router doing the NAT also shows the following message : ICMP: unreachable packet's src is not one of ours? Conditions: The issue is seen when the following two conditions are met : 1) Packet is dropped at "nat outside" interface by the router. 2) Dynamic overload NAT is being used (either pool overload or interface overload).
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Bug Details Include
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