Re: Weird DNS Problem, Timeouts ipv6?

#1 (**permalink**) 02-16-2008, 07:48 AM

Helmut Schneider wrote:
> Cory Albrecht (coryalbrecht+ACs-news+AEA-hotmail.com) wrote:
>> Helmut Schneider wrote:
>>> Cory Albrecht (coryalbrecht+newAQA-hotmail.com) wrote:
>>>> Helmut Schneider wrote:
>>>>> Michael Dombrowski <legodudenein+AEA-hammycorp.com> wrote:
>>>>>> This leads me to think there is some ipv6 problem... I haven't
>>>>>> touched the network settings on this machine and am not doing
>>>>>> anything with ipv6 on my router/network. Any ideas? This is a really
>>>>>> aggravating bug.
>>
>>>> This sounds a lot like the typical problem of when system has IPv6
>>>> capability but no actual IPv6 network links. The system does a DNS
>>>> query
>>>> and gets back an AAAA record for a host and then, because it has no
>>>> IPv6
>>>> link, it times out waiting for a response to an IPv6 connection to the
>>>> returned address. Could this also be Mr. Dombrowski's problem?
>>
>>> Yes. What does the faq say, activate pf and reject anything that sounds
>>> like IPv6?
>>
[...]
>> Out of curiosity, anybody involved with OpenBSD kernel development want
>> to comment on the feasibility of a sysctl item (call it
>> net.inet6.disable) that would effectively disable IPv6 and prevent
>> annoying timeouts like this without having to build a new kernel? Or
>> maybe just a "noipv6" for the options keyword in resolv.conf so IPv6
>> addresses never get returned?
>
> I've previously read a posting that removing or crippling IPv6 on
> OpenBSD would lead to an unexpected behaviour and will probably break
> IPv4, too. I Don't remember where and as I've never seen such a problem
> before...
>
I've heard this, too, but I've never been able to track down an
authoritative source. I know I've run 3.x boxes with a custom kernel
with IPv6 removed with no problems in the past.

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