Date: Wed, 19 Jul 2006 10:29:02 -0400 From: "David Robillard" <david.robillard@gmail.com> To: "Mikhail Goriachev" <mikhailg@webanoide.org> Cc: FreeBSD Questions Mailing List <freebsd-questions@freebsd.org> Subject: Re: :::. Sendmail & WorkAroundBrokenAAAA. Message-ID: <226ae0c60607190729n795082d6u9e990a9fb10163ff@mail.gmail.com>
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> Thanks for looking into this. I just realised that the domain in > question got fixed overnight after notifying the sysadmin. I guess this > is a good thing, yet I'm left puzzled with the difference between > confBIND_OPTS option and compiled INET6 support. Hello Mikhail, The difference is rather simple. The sendmail program will look up AAAA records only if it is built with the NETINET6 compile-time macro defined. If so, it looks up AAAA records first, then A records. Thus, if sendmail is not compiled for IPv6, then the resolver will never query AAAA records. Hence there will never have a problem related to the WorkAroundBrokenAAAA. See 24.9.91 as "ResolverOptions" and 9.2.7 as "Broken IPv6 Name Servers" in the sendmail book by O'Reilly (the so called Bat Book ISBN: 1-56592-839-3) The book recommends the following if you find a broken Name Server: a) Notifiy the hostmaster running the broken name server. The sooner the broken name servers are fixed, the cleaner the internet will run. b) Add the define(`confBIND_OPTS', `+WorkAroundBrokenAAAA')dnl into your sendmail.mc file. Regards, David -- David Robillard UNIX systems administrator & Oracle DBA CISSP, RHCE, Sun Certified Security Administrator
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