DNS 0 NOERROR vs 20 BADNAME
Both DNS 0 (NOERROR) and 20 (BADNAME) belong to the DNS Response Codes (RCODEs) category. 0 indicates that no error condition. The query completed successfully and the response contains the requested data. Meanwhile, 20 means that duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
설명
No error condition. The query completed successfully and the response contains the requested data.
이 코드를 보게 되는 경우
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
해결 방법
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
설명
Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
이 코드를 보게 되는 경우
A TKEY key establishment failed because a key with the same name already exists on the server from a previous session that was not properly cleaned up.
해결 방법
Use a unique key name for each TKEY session (e.g., append a timestamp or random suffix). Delete stale keys on the server if they are no longer needed.
주요 차이점
DNS 0: No error condition. The query completed successfully and the response contains the requested data.
DNS 20: Duplicate key name. The key name in a TKEY negotiation is already in use or conflicts with an existing key.
You encounter 0 when this is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
You encounter 20 when a TKEY key establishment failed because a key with the same name already exists on the server from a previous session that was not properly cleaned up.
언제 어떤 것을 사용할지
For 0 (NOERROR): No fix needed. RCODE 0 means the DNS lookup succeeded as expected. For 20 (BADNAME): Use a unique key name for each TKEY session (e.g., append a timestamp or random suffix). Delete stale keys on the server if they are no longer needed.