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NimbostratusInternal GTM seem seemed to have been unable to resolve dns names
Hello,
We had a situation where our internal GTM was unable to provide connection for a sub-domain for about 10 minutes. Just want to know the root cause or where I could start my investigation on the cause.
Thanks for the help.
7 Replies
Cory_50405Noctilucent
Can you elaborate a bit more on the setup? Is GTM recursively trying to query for this subdomain and is failing? Where is the subdomain authoritative? Another GTM or on the Internet?
ReynaldoQ_14206Internal Users complain about inability to connect to host within the .public.omega.intdata.com domain for about 10 minutes. Connection attempts times out. This domain names are being resolved by a GTM ver 10.2.3. To some, the problem was intermittent. I am unable to reproduce the problem from my box.- Cory_50405Those symptoms don't seem to indicate a GTM problem on the surface. For the users who are having the issues, it may be best to run a tcpdump on your GTM and verify if you are getting the DNS queries and responding to them. Or it could be unrelated to DNS at all, if the subsequent data connection after the DNS resolution is failing.
shaggyStart with a case with F5 Support - https://f5.com/about-us/contactregional-support
iHealth is a great diagnostic tool that F5 provides - you can upload a qkview and it provides some diagnostic output - https://f5.com/support/tools/ihealth
Some interesting BIGIP logs to start looking at:
- /var/log/gtm
- /var/log/ltm
- ReynaldoQ_14206Thanks shaggy
shaggy_121467Cumulonimbus
Start with a case with F5 Support - https://f5.com/about-us/contactregional-support
iHealth is a great diagnostic tool that F5 provides - you can upload a qkview and it provides some diagnostic output - https://f5.com/support/tools/ihealth
Some interesting BIGIP logs to start looking at:
- /var/log/gtm
- /var/log/ltm
- ReynaldoQ_14206Thanks shaggy
