Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Kriangkrai_Hong's avatar
Kriangkrai_Hong
Icon for Nimbostratus rankNimbostratus
Sep 05, 2019

How root hint works if it have multiple IP addresses

I have created DNS cache using Resolver type. In Root Hints, I have put 6 IP addresses in the list. Not sure how it works. Is it work in sequence from the first in the list?
application delivery
BIG-IP DNS
DNS
gtm
operations
skipjack's avatar
skipjack
Ret. Employee
Sep 30, 2019

Per K34350074, BIG-IP sends a "priming" request to each address in the list by randomly selecting an IP address from Root Hints. IF there are 6 addresses in the list, BIG-IP queries each address and then updates the cache with current root server information.