Default DNS cache expiration time in the Edge SWG (Proxy SG) appliance

Products

• ProxySG Software - SGOS

Issue/Introduction

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

Resolution

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 Article ID: How to know if a DNS result is cache-able 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 Article ID: Does the Edge SWG (ProxySG) cache a negative DNS response for more information. 

 

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