On 05/11/2015 10:31 AM, Andrei Borzenkov wrote:
I had issues with accessing some sites with IPv6 enabled. Not everyone lives in shiny new world and IPv6 support from providers can be quite buggy.
Most likely due to misbehaving name servers which should then be reported to hostmaster of the site.
If you disables IPv6 support in the kernel it only prevents the relevant network interfaces from being created, it does not result in disabling IPv6 name lookups from programs that makes an AF_UNSPEC or AF_INET6 request afaik hence you always end up double query the name servers ( with all it's downside ) unless you disable that within the application itself hence disabling ipv6 in the kernel makes little to no sense.
You can alleviate the downside of double lookups by adding "options single-request" or "options single-request-reopen" ( the latter probably solves most of the issues with misbehaving name servers ) to /etc/resolv.conf but afaik you cannot disable globally ipv6 lookups for all applications that perform it.
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