Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP DNS
Known Affected Versions:
12.1.1, 12.1.2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4
Fixed In:
13.1.1.5, 12.1.4.1
Opened: Mar 16, 2018 Severity: 3-Major
The DNS filter returns an erroneous invalidate response with EDNS0 CSUBNET Scope Netmask !=0.
If the response ECS Scope Netmask has a value other than '0', LTM drops it, causing timeout and retry on client side.
- Virtual Server configured with 'DNS Profile' set to 'dns' or a 'dns'-derived profile. - DNS queries with EDNS0 ECS option set.
There is no workaround at this time.
None