Preview Tool

Cisco Bug: CSCvu95121 - Static NAT outside breaks locally generated TCP/UDP traffic

Last Modified

Aug 25, 2020

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases

16.12.4 16.9.5

Description (partial)

Static NAT outside breaks return traffic for locally generated TCP/UDP sessions.

The issue is observed with IOS-XE software versions 16.9.x and 16.12.x.
The issue is only observed with static NAT outside configuration. 
TCP/UDP sessions originated by the router with NAT >>>Outside LOCAL<<< IP as destination IP.

NAT translation is created.
Return traffic is dropped with state "DROP 55  (ForUs)"
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.