48 lines
1.6 KiB
Markdown
48 lines
1.6 KiB
Markdown
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## ZONE02: SOA 'refresh' minimum value
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### Test case identifier
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**ZONE02** SOA 'refresh' minimum value
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### Objective
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The SOA refresh value is the number of seconds that describes
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how often a secondary name server will poll the primary name server
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to see if there is any updates. The SOA refresh value is described
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in section 3.3.13 in [RFC 1035](https://datatracker.ietf.org/doc/html/rfc1035),
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and clarified in section 2.2 of
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[RFC 1912](https://datatracker.ietf.org/doc/html/rfc1912).
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Setting the refresh value low will increase the DNS traffic between
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the servers, and also increase the load on the master name server.
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The primary name server will in most cases send DNS notifications to
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tell the secondary name servers that zone content has been updated,
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as described in [RFC 1996](https://datatracker.ietf.org/doc/html/rfc1996).
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The [RIPE-203](https://www.ripe.net/publications/docs/ripe-203) recommendation
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for the refresh value is 24 hours (86400 seconds). Older DNSCheck code
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had a four hour minimum value, and this is the minimum value we
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recommend.
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### Inputs
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The domain name to be tested.
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### Ordered description of steps to be taken to execute the test case
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1. Retrieve the SOA record from a delegated name server for the domain.
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2. If the answer from step 1 is not authoritative, iterate step 1 until there is an authoritative answer.
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3. Retrieve the refresh value from the SOA record.
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4. If the refresh value is less than 14400 (four hours in seconds)
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this test case fails.
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### Outcome(s)
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If the SOA refresh value is less than 14400 this test case fails.
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### Special procedural requirements
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None.
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### Intercase dependencies
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None.
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