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Narendren_S's avatar
Narendren_S
Icon for Nimbostratus rankNimbostratus
Mar 03, 2014

Issue with GTM loadbalancing for Active-Active sites

Hi,   Below is the detail regarding the end users, application requirement, GTM/LTM setup and configuration.   Details about end users:   80% users are from 3 private LANs located at differ...
BIG-IP DNS
bhs_114985's avatar
bhs_114985
Historic F5 Account
Mar 10, 2014

Hello,

 

"However, PRIVATE_LAN user DNS queries are originated via very few DNS servers and hence loadbalancing is not happening properly. Note: Consider we have enabled GTM persistence. (as per application requirement) If 1000 requests originated from a private LAN, all those DNS requests resolved to single site LTM VIP since DNS persisted."

 

  • Check your TTL's.
  • Make sure your internal DNS servers can all get to the GTM's.
  • Make sure no internal caching server is in play.
  • Make sure your LB Method is Round Robin with no persistence.
  • You could always do an iRule to drop persistence but still load balance if the requesting dns server/s ip equals X.