Date: Mon, 9 Oct 2006 15:02:02 -0500 From: pckizer@nostrum.com To: Wojciech Puchar <wojtek@tensor.3miasto.net> Cc: freebsd-questions@freebsd.org Subject: Re: strange DNS problem Message-ID: <8F1AFBF2-8CBC-4E9A-930F-137EB0B6324A@nostrum.com> In-Reply-To: <20061006105745.V54913@chylonia.3miasto.net> References: <20061006105745.V54913@chylonia.3miasto.net>
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On 2006, Oct 6, at 04:02, Wojciech Puchar wrote: > one of my users reporting problem sending e-mail to @mil.be > sendmail reports host name lookup failure > host reports > > [wojtek@chylonia ~]$ host -t mx mil.be > mil.be mail is handled by 10 hermes01.mil.be. > > [wojtek@chylonia ~]$ host -t a hermes01.mil.be > hermes01.mil.be has address 194.7.21.40 > hermes01.mil.be has address 193.191.219.40 > Host hermes01.mil.be not found: 2(SERVFAIL) > ^^^^^^^^^^^^^ > > where's a problem? while hostr is able to get IP addresses but then > reports servfail? What you are seeing is the IPv6 AAAA lookup: # host -t aaaa hermes01.mil.be Host hermes01.mil.be not found: 2(SERVFAIL) Make sure you have the Sendmail option turned on to ignore the SERVFAIL messages: # grep AAAA /etc/mail/freebsd.mc define(`confBIND_OPTS', `WorkAroundBrokenAAAA') # grep AAAA /etc/mail/sendmail.cf O ResolverOptions=WorkAroundBrokenAAAA With that, mail should flow fine. Though I have to admit I am having a similar problem except the host is randomly (with a very high probability of it doing so) failing to respond at all rather than at least answering SERVFAIL. With no SERVFAIL it appears Sendmail/resolver consider the NS host to be down and do not fail through to try and lookup the A record. [I'm still trying to verify that.] -philip
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