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2funky_105078's avatar
2funky_105078
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Apr 22, 2014

GTM: avoiding flapping DNS answers with RTT method

I am in the need to understand how GTM metrics work for GTM LDNS probes.   1) how they can be logged the decision? I am using 11.2 but moving fast to 11.4.1.. :)   2) Lets make an example. if...
BIG-IP DNS
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dns
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  • Cory_50405's avatar
    Cory_50405
    Apr 23, 2014

    The only solution I could see in your situation is to break your single pool into three pools, and either stick with RTT and enable persistence at the wide IP, or switch to topology. Either one should get you some more consistency.

     

2funky_105078's avatar
2funky_105078
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Apr 23, 2014

The problem - differently said - is that if i have only 3 VIPs associated to a global application and this should be accessible from anywhere in the world, there will always be a place where there is flapping.

 

For example, if i have a user with LDNS exactly in the middle (from the RTT point of view) between 2 different DCs, how can I remove the tedious flappping issue?