DNS 4 NOTIMP vs 8 NXRRSET
Both DNS 4 (NOTIMP) and 8 (NXRRSET) belong to the DNS Response Codes (RCODEs) category. 4 indicates that not Implemented. The name server does not support the requested query type or operation. Meanwhile, 8 means that rR Set that should exist does not. A required resource record set is missing from the zone.
描述
Not Implemented. The name server does not support the requested query type or operation.
何时出现
You sent a query type (e.g., IXFR, dynamic update) that the server does not support or has disabled.
如何修复
Verify the server supports the query type you are using. If you need zone transfers or dynamic updates, enable them in the server configuration.
描述
RR Set that should exist does not. A required resource record set is missing from the zone.
何时出现
A DNS UPDATE prerequisite expected a certain RRset to exist (e.g., an MX record), but the zone does not contain it.
如何修复
Create the missing RRset in the zone before retrying the update, or change the prerequisite to not require its existence.
主要区别
DNS 4: Not Implemented. The name server does not support the requested query type or operation.
DNS 8: RR Set that should exist does not. A required resource record set is missing from the zone.
You encounter 4 when you sent a query type (e.g., IXFR, dynamic update) that the server does not support or has disabled.
You encounter 8 when a DNS UPDATE prerequisite expected a certain RRset to exist (e.g., an MX record), but the zone does not contain it.
何时使用哪个
For 4 (NOTIMP): Verify the server supports the query type you are using. If you need zone transfers or dynamic updates, enable them in the server configuration. For 8 (NXRRSET): Create the missing RRset in the zone before retrying the update, or change the prerequisite to not require its existence.