[dns-operations] Going to full IPv4+IPv6 in .CZ

Chuck Anderson cra at WPI.EDU
Wed Mar 10 21:08:05 UTC 2010

On Wed, Mar 10, 2010 at 07:44:59PM +0000, Robin Stevens wrote:
> We recently encountered an odd issue where one morning we had a bunch
> of complaints of problems in resolving .org domain names.  Our
> nameservers used kernels with IPv6 support but no default v6 route and
> only a scope link fe80:: address.  Yet our investigations showed these
> systems were nevertheless attempting to make v6 connections and had some
> very odd v6 routing table entries.  Disabling v6 support appeared to
> cure the problems, but it's possible the cause was unrelated - other
> pressures and the fact these servers are shortly to be replaced meant
> that unfortunately we didn't investigate further.  

Maybe someone plugged in a Windows box with ICS turned on?  ICS will 
send RAs to become a default router for the LAN...

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