[AusNOG] IPv6 - test ...

Chris Knight stryqx at gmail.com
Sat Mar 9 13:17:51 EST 2013

Hi Jeremy,

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 -
 On 08/03/2013 1:37 PM, "Jeremy Visser" <jeremy at visser.name> wrote:

> On 08/03/13 13:27, Don Gould wrote:
> > sorry guys, just ignore, I'm just running a tcp dump as requested to see
> > if we can figure why my traffic isn't heading via v6.
> To save further noise, five minutes ago I set up
> blackhole at sunriseroad.net (dual-stack) and
> blackhole at ipv6.sunriseroad.net (IPv6-only) that you can use to test.
> My /etc/aliases contains:
>   blackhole: "|/bin/true"
> Feel free to spam that address anyone setting up IPv6 mail. Just tested
> with work's Exchange 2010 server and it appears to work fine.
> Interestingly enough, despite our Exchange being dual-stack, it always
> prefers IPv4. Wonder if that is configurable.
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