OPS535 Advanced DNS

• DNS Logging
  • logging Statement Definition and Usage

Sample:
    logging {
            channel default_debug {
                    file "data/named.run";
                    severity dynamic;
            };
    };

• Dynamic DNS
  • Dynamic Zone - Allow-update
  • Dynamic DNS update using nsupdate

Man Page:
         nsupdate is used to submit Dynamic DNS Update requests as defined in RFC 2136 to a name server. This allows resource records to be added or removed from a zone without manually editing the zone file. A single update request can contain requests to add or remove more than one resource record.

• TSIG - Transaction SIGnatures
  • BIND primarily supports TSIG for server to server communication.
  • TSIG can also be useful for dynamic update.The nsupdate program supports TSIG via the -k and -y command line options or inline by use of the key.
• DNSSEC
  • Cryptographic authentication of DNS information is possible through the DNS Security (DNSSEC-bis) extensions, defined in RFC 4033, RFC 4034, and RFC 4035.