Guest

Preview Tool

Cisco Bug: CSCul26755 - INSPECT ICMP ERROR ICMP HEADER AFTER UN_NAT DOES NOT MATCH IP DST ADDR

Last Modified

May 07, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

8.4(5.7) 8.4(7.4) 9.1(1.5) 9.1(3.107)

Description (partial)

Symptom:
When several ICMP error packets come back to an ASA performing PAT/NAT with inspect icmp error enabled,
the inspection will rewrite the original IP addresses in the ICMP header by matching the xlate.
Then, this packet should be forwarded back to the originating host using the same original IP as the destination IP address.

These two IP address do not match and it should. The packet is then forwarded wrongly to the wrong host.

Conditions:
icmp inspect error configured
Bug details contain sensitive information and therefore require a Cisco.com 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.