Date: Tue, 16 Mar 2004 19:15:04 +1100 From: Mark Andrews <Mark_Andrews@isc.org> To: "Dave Hart" <davehart@davehart.com> Cc: Rick Knospler <rick@skylands.net> Subject: Re: ftp.perl.org strangeness Message-ID: <200403160815.i2G8F4qW049162@drugs.dv.isc.org> In-Reply-To: Your message of "Tue, 16 Mar 2004 07:55:57 -0000." <255A839665EA24408EB27A6AAE15518EAC1B@europa.ad.hartbrothers.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> I've run across this issue with a few websites in the last 18 months. > It might help to ask if they're using a "load balancer" on > ddns5.develooper.com (the nameserver for ddns.develooper.com which is > the zone containing ftp.cpan.ddns.develooper.com which is CNAMEd from > ftp.perl.org). One DNS-based load balancing product exhibited this > broken behavior, though I don't know which product it was. When queried > for type A or any type, the correct responses are returned, but when > querying for AAAA, NXDOMAIN is returned, which is evil because it > communicates false information that there are no records of any type at > that name. Since IPv6-enabled clients query AAAA before A or any, they > tend to trip up 100% of the time. I've not yet heard of a > general-purpose DNS server getting this wrong, I assume any such > offenders were fixed earlier in the 8 years of AAAA. DNS-based load > balancers are on average greener. The general purpose servers *never* had this problem. > I ran across this first with a major computer reseller website and > complained to their admins. It took many months for them to get the fix > from their load-balancing vendor and convince themselves it was safe, > but they did eventually correct the fault. > > ask <at> develooper.com is listed as the contact in the SOA for > ddns.develooper.com, hopefully including them on this email will get the > ball rolling. > > Dave Hart > davehart@davehart.com > -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: Mark_Andrews@isc.org
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200403160815.i2G8F4qW049162>