DNS Asynchronous Refresh

With this behavior enabled, the edge servers can use an expired origin DNS record (an A record associating a hostname with an IP address) when forwarding a request to your origin.

How it works

Your originโ€™s DNS record is refreshed after serving the end-userโ€™s request, so the end-user doesn't have to wait for the DNS resolution. Don't use this behavior if you donโ€™t want a DNS record to be reused after it expires. For example, if you take down a server immediately after the DNS record associated with it expires, this behavior instructs the โ€‹Akamaiโ€‹ edge server to forward requests made to the server you took offline. This results in a denial of service to your end-user.

Features and options


What it does


Enables or disables the behavior.


Set the maximum allowed time an expired DNS record may be used.

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