Preview Tool

Cisco Bug: CSCta33419 - ASA VPN dropping self-sourced ICMP packets (PMTUD)

Last Modified

Nov 08, 2016

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases


Description (partial)

Path-MTU Discovery is not working through ASA if it is configured as VPN hardware client (VPN Remote) and configured to tunnel all traffic.

Packets sent with DF bit are dropped on the ASA. 
MTU of outside interface is set to a lower MTU, so that packets from the inside hosts would have to be fragmented.
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.