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.
Beschreibung
No error condition. The query completed successfully and the response contains the requested data.
Wann Sie es sehen
This is the normal, successful response to any DNS query — the name was resolved and the answer section contains the requested records.
Wie man es behebt
No fix needed. RCODE 0 means the DNS lookup succeeded as expected.
Beschreibung
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.
Wann Sie es sehen
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.
Wie man es behebt
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.
Wesentliche Unterschiede
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.
Wann welchen verwenden
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.