[outages] [Outages-discussion] Wikipedia suffers global outage.

[Jay R. Ashworth]

----- "paul e" <list-outages at dragon.net> wrote:
> >> Update: Unfortunately, for many, this outage seems to have lasted
> >> longer than an hour. It appears that many ISPs=92 DNS resolvers do
> >> not honor the so-called Negative Cache TTL that we send (1 hour), and
> >> instead use a longer value. We have circumvented this problem by
> >> renaming the affected DNS record to something else.
> 
> cmadams> I'm curious: what software/settings are these "many ISPs" using
> cmadams> that does this?  I've seen this mentioned before, but BIND for
> cmadams> example doesn't have an option to do this IIRC.
> 
> ncache is set on the auth server for the zone, in the SOA record. It's
> the 'minimum' timer, the last of the 4 timers after serial number. See
> RFC 2308 for how negative caching works.
> 
> Any RFC compliant resolver should deal with this correctly. BIND does
> the correct thing, both on the auth server side and as a recursive
> resolver.

Is it possible that the condition being discussed -- which I have also heard
alleged before, without citation, has something to do with section 14.5.7, 
at:

http://docstore.mik.ua/orelly/networking_2ndEd/dns/ch14_05.htm

Cheers,
-- jra

-- 
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