Last Modified: Aug 25, 2026
Affected Product(s):
BIG-IP DNS
Fixed In:
21.1.0.1
Opened: Apr 08, 2026 Severity: 3-Major
With serve-expired enabled on a DNS cache resolver, records at TTL=0 no longer appear in the rrset cache via tmsh show and cannot be deleted via tmsh delete, yet they may still be served to clients as stale responses.
Records could still be served to clients as stale responses via the serve-expired mechanism.
Serve-expired is enabled for a DNS cache resolver
N/A
None