DNS 0 NOERROR vs 16 BADVERS/BADSIG
Both DNS 0 (NOERROR) and 16 (BADVERS/BADSIG) 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, 16 means that bad OPT Version or TSIG Signature Failure. Either the EDNS version in the OPT record is not supported, or the TSIG signature on the message failed verification.
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
Bad OPT Version or TSIG Signature Failure. Either the EDNS version in the OPT record is not supported, or the TSIG signature on the message failed verification.
이 코드를 보게 되는 경우
As BADVERS: your client sent an EDNS version higher than the server supports. As BADSIG: the TSIG MAC on the message did not match, indicating a shared-secret mismatch or message tampering.
해결 방법
For BADVERS, downgrade the EDNS version (most servers support version 0 only). For BADSIG, regenerate and re-synchronize the TSIG shared secret on both endpoints.
주요 차이점
DNS 0: No error condition. The query completed successfully and the response contains the requested data.
DNS 16: Bad OPT Version or TSIG Signature Failure. Either the EDNS version in the OPT record is not supported, or the TSIG signature on the message failed verification.
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 16 when as BADVERS: your client sent an EDNS version higher than the server supports. As BADSIG: the TSIG MAC on the message did not match, indicating a shared-secret mismatch or message tampering.
언제 어떤 것을 사용할지
For 0 (NOERROR): No fix needed. RCODE 0 means the DNS lookup succeeded as expected. For 16 (BADVERS/BADSIG): For BADVERS, downgrade the EDNS version (most servers support version 0 only). For BADSIG, regenerate and re-synchronize the TSIG shared secret on both endpoints.