[AusNOG] IPv6 - test ...

Jethro Carr jethro.carr at jethrocarr.com
Sat Mar 9 13:30:44 EST 2013

On Sat, 2013-03-09 at 13:17 +1100, Chris Knight wrote:
> Exchange Server 2010 will follow the protocol preference set by the
> OS. Sounds like work has set the underlying OS to preference IPv4 over
> IPv6. More information on how this is done here -
> http://support.microsoft.com/kb/929852

Speaking of Exchange and IPv6....

If you're running Exchange and Active Directory on the same host (not
uncommon for a SMB type setup), do not disable IPv6 in the OS as it will
seriously cripple the system. 

I've seen this done when there was problems with the Exchange server
incorrectly trying to connect to an upstream smart host using IPv6,
despite the network being IPv4 only... Another engineer decided to fix
it by disabling IPv6 entirely, which resulted in a situation where
Exchange could no longer talk to AD, as it uses IPv6 for internal

If you want to know more, or want to know how badly you can mess up the
day of the Windows sysadmins at work, read more here:


Jethro Carr
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