0

As the title suggests what does "Warning: query response not set" mean. I see the following in the dighost.c (line 2888 and 2889) source but still am uncertain with what in my DNS servers response would cause it.

if (result == ISC_R_SUCCESS && (msgflags & DNS_MESSAGEFLAG_QR) == 0)
    printf(";; Warning: query response not set\n");
Improve this question
1
  • 1
    What DNS server software elicited that warning from dig?
    – Steven Monday
    Oct 21, 2010 at 5:12

2 Answers 2

Reset to default
4

The QR bit (the MSB in the 3rd octet in the header) indicates whether the packet is a request (0) or a response (1).

All clients MUST therefore send packets with that bit clear, and the server MUST send it back with that bit set. The error messages tell you that a response was received that was flagged as a request.

BTW, there was a known bug in the Microsoft DNS server some years back where it would answer a packet even if the QR bit was set in that packet! As a result it was possible to cause a packet loop.

Improve this answer
1
  • Missed to mention the specification: rfc1035
    – deFreitas
    Feb 21, 2023 at 20:16
1

Looks like this is due to incorrect setting of the QR portion of the response header.

Improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .