nanog mailing list archives
Re: Connectivity to an IPv6-only site
From: Kevin Buhr <buhr+nanog () asaurus net>
Date: Sat, 24 Apr 2010 20:02:47 -0500
Valdis.Kletnieks () vt edu writes:
Ours are currently intentionally configured to not issue queries over IPv6, because at one time, there were *so many* sites that listed unreachable quad-A NS records. Our DNS guy is more than willing to revisit that config switch. Anybody have some statistics on what the current situation is?
I just dredged a list of 570 one, two, and three-dot domains from a mailing list (a bunch of recent messages on debian-user). Digging them gave 919 unique nameserver domain names, and digging those gave 119 AAAA addresses. Of these, 106 responded to a DNS query (for the nameserver's own AAAA address) in some fashion, and 13 didn't. Of the 13, 5 were cogentco.com DNS servers and unreachable over my HE tunnel thanks to ongoing peering disputes. In all cases, the nameservers with AAAA addresses had A addresses as well. (I got similar results with a list of domains taken from recent NANOG postings, but then decided to look at the debian-user results in case NANOG was unrepresentative.) Anyway, it looks like bad IPv6 nameserver addresses are the exception rather than the rule. Whether to flip on IPv6 queries will sort of depend on how your resolvers behave when they receive a typical "bad" response with 2 broken IPv6 addresses and 2 working IPv4 addresses. -- Kevin <buhr+nanog () asaurus net>
Current thread:
- Re: Connectivity to an IPv6-only site, (continued)
- Re: Connectivity to an IPv6-only site Brielle Bruns (Apr 23)
- Re: Connectivity to an IPv6-only site Valdis . Kletnieks (Apr 23)
- Re: Connectivity to an IPv6-only site Leo Bicknell (Apr 23)
- Re: Connectivity to an IPv6-only site Franck Martin (Apr 23)
- Re: Connectivity to an IPv6-only site Jack Bates (Apr 24)
- Re: Connectivity to an IPv6-only site Stephen Sprunk (Apr 26)
- Re: Connectivity to an IPv6-only site Christopher Morrow (Apr 26)
- Re: Connectivity to an IPv6-only site Mark Andrews (Apr 26)
- Re: Connectivity to an IPv6-only site Joe Abley (Apr 28)
- Re: Connectivity to an IPv6-only site joel jaeggli (Apr 30)
- Re: Connectivity to an IPv6-only site Kevin Buhr (Apr 24)
- Re: Connectivity to an IPv6-only site Owen DeLong (Apr 25)
- Re: Connectivity to an IPv6-only site Larry Sheldon (Apr 23)
- Re: Connectivity to an IPv6-only site Brielle Bruns (Apr 23)
- Re: Connectivity to an IPv6-only site Larry Sheldon (Apr 23)
- Re: Connectivity to an IPv6-only site Geoff Huston (Apr 24)
- Re: Connectivity to an IPv6-only site Owen DeLong (Apr 23)
- Re: Connectivity to an IPv6-only site Jason Fesler (Apr 25)