Hello, Tony van der Hoff a écrit : > > I run my own caching BIND9 under squeeze, and as far as I'm aware it's > correctly set up. > > I'm using Thunderbird as my MUA, with an IMAP host on my VPS, > smtp.vanderhoff.org. > > When trying to read or send mail I invariably get a DNS timeout: > Dec 28 10:11:23 tony-lx named[1768]: error (unexpected RCODE SERVFAIL) > resolving 'smtp.vanderhoff.org/AAAA/IN': 91.121.205.64#53
The authoritative DNS servers for your domain, ns0.ukpost.com and ns1.ukpost.com, are broken. If the domain name smtp.vanderhoff.org has no record of a given type (AAAA or other), the NS should not reply with status=SERVFAIL but with status=NOERROR and answer=0. > Dec 28 10:11:27 tony-lx named[1768]: error (network unreachable) > resolving 'smtp.vanderhoff.org/AAAA/IN': 2001:41d0:1:d640::1#53 That is perfectly normal if your caching NS server has no IPv6 connectivity. It should not cause any delay. > Well, that appears to be looking for an IPv6 address, and as my router > doesn't support IPv6, it's bound to go wrong. No. Lack of IPv6 support should be handled gracefully. > Any suggestions, please? 1) Ask your registrar to fix their DNS servers. 2) Disable IPv6 resolution in Thunderbird by setting network.dns.disableIPv6=true in the config editor. 3) Disable IPv6 in BIND by adding -4 in the OPTIONS line in /etc/default/bind9. That will stop the "network unreachable" messages. Alternatively, add the option "forward only;" so that BIND will query only the IPv4 addresses defined in the forwarders option and will not try to perform its own recursive resolution if they fail. -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
