Cowboy Denny Posted October 3, 2022 Share Posted October 3, 2022 Here are some notes I have collected to help troubleshoot DNS issues on the F5 GTM in hopes it helps someone. If you have some additional helpful notes, please share. check out the logs for zone transfers AXFR IXFR Link to comment Share on other sites More sharing options...
Cowboy Denny Posted April 27 Author Share Posted April 27 In reference to clearing cache SHOW ALL RECORDS in CACHE tmsh show ltm dns cache records rrset cache non-wideip-transparent-cache DELETE ALL RECORDS in CACHE tmsh delete ltm dns cache records rrset cache non-wideip-transparent-cache SHOW SPECIFIC RECORD in CACHE tmsh show ltm dns cache records rrset cache non-wideip-transparent-cache owner fqdn.example.com DELETE SPECIFIC RECORD in CACHE tmsh delete ltm dns cache records rrset cache non-wideip-transparent-cache owner fqdn.example.com NOTE: DNS server will cache a response only for as long as the TTL in the response. So setting a Maximum TTL in the Cache settings overrides any TTL response longer than 1 day. Standard TTL response is typically 3600 seconds so this shouldn’t be an issue. EXTRA USEFUL SHOW COMMANDS tmsh show ltm dns cache records key cache non-wideip-transparent-cache tmsh show ltm dns cache records nameserver zone-name corp cache non-wideip-transparent-cache EXTRA USEFUL DELETE COMMANDS tmsh delete ltm dns cache records <rrset|msg|nameserver|key> <property> <property value> <DNS Cache name> tmsh delete ltm dns cache records rrset owner example.com cache exampleCache Link to comment Share on other sites More sharing options...
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