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Re: disabling ipV6

Thanks for your time, Pascal.

On 31/12/11 14:20, Pascal Hambourg wrote:

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,

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':

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.

Can you please tell me where that's documented, so I can hit them eith a reference?

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.

Well it's a crap router, for various reasons, including this. I'm biding my time until an affordable IPv6 ADS router becomes available.

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.

OK, thanks

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.

OK, thanks.

I'll see how that goes. Thanks to all.

Tony van der Hoff        | mailto:tony@vanderhoff.org
Buckinghamshire, England |

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