• Want to know default DNS cache expiration time
• Want to know how can DNS cache expiration time can be changed

Q: What is the default DNS cache expiration time?
A: Whether or not a DNS query cached is based on the response from the respective DNS server(s):

• If DNS responds that the query is non-cacheable, the cache time-to-live (TTL) is set to 0.
• If DNS responds that the query is cacheable, the cache TTL is set to a value in seconds.

Refer to 000011209 for more details.

Q: Can I change the DNS cache expiration time on the appliance?
A: No. You cannot change the DNS cache expiration time on the appliance.

For the cache TTL of negative DNS responses, refer to 000009088 for more information. 

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