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Forum Discussion

Roman_Romalis's avatar
Roman_Romalis
Icon for Nimbostratus rankNimbostratus
May 29, 2014

GTM persistence with load balancing

We have an enclosed validation environment which forces clients to use the same local DNS. We're running round robin on the GTM, and after turning on persistence all the clients are being sent to onl...
BIG-IP DNS
deployment
mimlo_61970's avatar
mimlo_61970
Icon for Cumulonimbus rankCumulonimbus
May 29, 2014

It could be a number of things, so first some questions.

 

Do the clients query the GTM directly as their DNS server, or are they using some intermediate DNS server? If they use an intermediate server, this DNS server is receiving a response from the GTM and caching it, and giving the same answer to all of the clients using it.

 

What is the Persist CIDR set to in the GTM Pool? The setting here will determine the size of the persist record. For instance 32 will keep track of persistence for every unique address, but 24 would give the same answer to systeming in the same /24 network(assuming ipv4)

 

Do the clients all have unique IP addresses, or is something NAT'ing them on their way? Obviously if they all share the same source IP, then they all look the same to the GTM.