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Top Forums UNIX for Beginners Questions & Answers What determines DNS will query IPV6 address? Post 303043330 by broy32000 on Friday 24th of January 2020 11:32:32 AM
Old 01-24-2020
What determines DNS will query IPV6 address?

When I do simple nslookup it does not generate any query for IPV6 (AAAA). But sometimes I see DNS query for both A and AAAA are generated. What decides this? The reason I do not want AAAA query is in most of the cases AAAA records are absent. Hence, if one DNS server fails, the clients keeps attempting to send AAAA query.
 

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DANE(1) 							  Internet / DNS							   DANE(1)

NAME
dane - Generate TLSA/HASTLS DNS records by scanning SSL/TLS sites SYNTAX
dane [-v] [-q] [-h] [-v] [--draft|--rfc] [--sha256] [--sha512] [--full] [--insecure] [--pubkey] [--txt] [--eecert] [--cacert] [-4] [-6] [--axfr] [-n <nameserver>] host1 [host2 ...]] [@nameserver]] DESCRIPTION
dane generates TLSA/HASTLS records based on the IETF DANE working group proposal. These are currently in draft, so private RRTYPE assignments are used. Records are generated by connecting to the website using SSL and grabbing its (EE) certificate. If the nameserver of the domain allows zone tranfers (AXFR), an entire domain can be processed for all its A/AAAA records. OPTIONS
-n / --nameserver <hostname1> Use specified nameserver for AXFR query -q / --quiet Supress all warnings - useful when scanning lots of host where some do not run SSL --axfr Use AXFR. Implies -n nameserver (or @nameserver). Hosts are treated as zones to AXFR. --tlsa Output TLSA record from SSL server scan results (default) --eecert Output TLSA record format EE certificates (type 1) (default) --pubkey Output TLSA record for just the public key (type unassined) (not implemented yet) --txt Output Kaminsky style TXT record for (not implemented yet) --cacert Output TLSA record for the entire CA chain and EE-cert (not yet implemented) --sha256 Output TLSA record reference type 1 (SHA256) records (default) --sha512 Output TLSA record reference type 2 (SHA512) records --full Output TLSA record reference type 0 (full cert) records --draft Output Unknown Resource Record format with private RRTYPE assignment. This is used while the standard is still in draft form, and for when your nameserver does not (yet) support the new RRTYPE names. This option is the default (if --rfc is not specified) as long as dane is has not be released as RFC. --rfc Specify records using the RRTYPE's TLSA (and HASTLA) --insecure Continue scanning even if the A/AAAA records could not be validated using DNSSEC -4 Only use ipv4 networking - do not attempt to connect to AAAA SSL sites -6 Only use ipv6 networking - do not attempt to connect to A SSL sites -h / --help Output help information and exit. -v / --version Output version information and exit. FILES
~/.ssh/known_hosts REQUIREMENTS
dane requires python-dns and python-argparse(http://www.pythondns.org) Fedora: yum install python-dns python-argparse Debian: apt-get install python-dnspython python-argparse BUGS
I'm sure there are EXAMPLES
typical usage: dane www.xelerance.com dane --rfc --sha512 www.xelerance.com dane --insecure --draft xelerance.com @ns0.xelerance.net SEE ALSO
sshfp(1) ssh(1) and RFC-XXXX http://www.xelerance.com/software/sshfp/ http://lists.xelerance.com/mailman/listinfo/sshfp/ AUTHORS
Paul Wouters <paul@xelerance.com> COPYRIGHT
Copyright 2011 Xelerance Corporation This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License (file COPYING in the distribution) for more details. Paul Wouters April 12, 2011 DANE(1)
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