DNS 4 NOTIMP vs 7 YXRRSET
Both DNS 4 (NOTIMP) and 7 (YXRRSET) 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, 7 means that rR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
Описание
Not Implemented. The name server does not support the requested query type or operation.
Когда вы это видите
You sent a query type (e.g., IXFR, dynamic update) that the server does not support or has disabled.
Как исправить
Verify the server supports the query type you are using. If you need zone transfers or dynamic updates, enable them in the server configuration.
Описание
RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
Когда вы это видите
A DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
Как исправить
Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.
Ключевые различия
DNS 4: Not Implemented. The name server does not support the requested query type or operation.
DNS 7: RR Set Exists when it should not. A resource record set exists that the update prerequisite says should not.
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 7 when a DNS UPDATE failed because a specific RRset (e.g., an A record) already exists when the prerequisite required it to be absent.
Когда что использовать
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 7 (YXRRSET): Delete the conflicting RRset before retrying the update, or adjust your prerequisite conditions to match the actual zone state.