Cisco Bug: CSCur44103 - ASR1k: Port leak while using NAT with interface mappings
Sep 14, 2019
- Cisco ASR 1000 Series Aggregation Services Routers
Known Affected Releases
Symptom: An ASR1k router will run out of internal ports to be allocated for a given application. This can impact applications such as telnet, FTP, TACACs, etc. For example, when trying to telnet to a locally defined IP address, the following will be seen if all the internal ports are leaked: ASR1k#telnet 188.8.131.52 Trying 184.108.40.206 ... % Out of local ports Conditions: This issue is seen when overloading NAT and using an interface-based mapping "ip nat inside source list ACLNAME interface GigabitEthernet0/0/0 overload" This issue is only applicable to ASR1k routers.
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Bug Details Include
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