Bug ID 879169: RESOLV::lookup @<virtual server name> may not work

Last Modified: Mar 02, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP Install/Upgrade, LTM(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.1.0,,,,,, 14.1.2,,,,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 16.1.0

Fixed In:
17.0.0, 16.1.1, 15.1.4

Opened: Feb 10, 2020
Severity: 3-Major


In v13 later, iRule command RESOLV::lookup @<vs name> does not work


The DNS virtual is working while iRule RESOVE::lookup does not send request to the virtual.


The virtual server targeted by the RESOLV::lookup command is not configured with IP protocol UDP ("ip-protocol udp" in TMSH)


Either of these: 1. Modify the target virtual server to specify an IP protocol of UDP 2. Replace the name with IP address to workaround the issue. set hostip [RESOLV::lookup @ -a $hostname]

Fix Information


Behavior Change