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ACE: Best practices for DNS load balancing?

I have ace load balancing for two DNS servers in our infrastructure, we may add more in the future. I am looking for configuration examples or best practices to get the best performance. I have attached the sample config. There is some config ommited. We have two ace modules in separate DR server rooms.

I am noticing a lot of connections seem to stay connected for a long time and timeout eventually. I have reduced the timeout to reduce this and it seems to have improved the situation. I am struggling to work out how to get UDP fast aging or UDP booster working in my scenario.

Any ideas or suggestions of how to improve are welcome.

Thanks.

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