Hello DNS gurus,
I'm writing a minimalistic DNS server (in python, using the dnspython
module), whose purpose will simply be to provide AXFR for a fixed set of
zones. The clients will be BIND and/or NSD. It will send NOTIFY messages
to the clients, and provide (some) responses.
As far as I can see, my small DNS server needs to do the following:
1. Listen on UDP/53, and:
1a. return REFUSED responses for any zones I haven't loaded;
1b. return NOTIMP responses to queries other than SOA; and
1c. return a NOERROR response for zones I have, with the SOA record in
the answer section, setting the AA bit. Do I need to fill the authority
section too?
2. Listen on TCP/53, and:
2a. return REFUSED responses for any zones I haven't loaded; and
2b. return NOTIMP responses to queries other than AXFR; and
2c. return the zone in response to AXFR.
Have I missed anything obvious?
Regards,
Anand
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