FAQ: Does Sentry cache DNS results?

Sentry does cache DNS lookup results.

Positive Cache: 600 seconds (10 minutes)
Negative Cache: 10 seconds

This is the default behavior. You can also control the caching on a per remote policy basis. To be able to set the caching settings on a per policy basis, you have to enable the user preference "Enable DNS cache override" on the System>>Settings>>Preferences page.

You can clear the DNS cache with the CLI command "network utils dns-flush".

You can do a lookup with "network utils dns-lookup".

Lastly, you can add static host entries to bypass DNS with the CLI command "network static-host add".

 

DNS caching is also dictated by the DNS servers. The DNS servers return a response with a TTL attached to it. So, when flushing the local resolver cache, the next queries will be cached again.

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