[AusNOG] IPv6 - test ... Testing your dual stacked mail system is moving mail on v6 - helpful resources.

[Don Gould]

On 8/03/2013 3:37 p.m., Jeremy Visser 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.

Can you make that do an out of office bounce back?  That would be more 
helpful to see what's coming back in the headers.


>
> 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.


Interesting, so what we're learning here is that these numbers we're 
seeing about v6 traffic are a bit meaningless and no indication of demand.

Guys have dual stacked stuff but they're just not moving any traffic on 
it.  Sort of need to fix that for obvious reasons.

D

-- 
Don Gould
31 Acheson Ave
Mairehau
Christchurch, New Zealand
Ph: + 64 3 348 7235
Mobile: + 64 21 114 0699