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Re: IPv6 dual stacking and route tables
From: -Hammer- <bhmccie () gmail com>
Date: Fri, 03 Feb 2012 15:04:18 -0600

OK. Looking forward to getting the lab up. Since I can handle the volume I'll take both tables. At least in the lab. Looking forward to doing some experiments with DNS just to see what all the fuss is about. Looks like I'll need to order a Mac for the lab. No harm there. :)


"I was a normal American nerd"
-Jack Herer

On 2/3/2012 2:47 PM, Jeroen Massar wrote:
On 2012-02-03 21:37 , -Hammer- wrote:
Thanks Jeroen (and Ryan/Philip/Cameron/Justin/Etc.) for all the online
and offline responses. That was fast. The struggle is that I'm having
trouble seeing how/why it would matter other than potential latency on
the IPv4 side. IPv6 conversations usually involve taking the full table
when dealing with multi-homed/multi-site setups. IPv4 I didn't really
consider (taking the full table) until I mentioned this to some of my
vendors technical folks and it caused a lot of reflection. Not on the L3
part. Just on the DNS part. This appears to be a tough subject area when
it comes to V4/V6 deployment strategies. The bottom line is that I'll
take whatever the carrier feeds in V6. Just trying to see where I would
be missing out by not doing the same in V4. Again, I have the hardware
to support it and I really have no reason not to do it. I just want to
be able to justify to myself why I'm doing it.
Why you want non-defaults in both IPv4 and IPv6:
  - more possible paths
  - less chances of blackholes.

And of course, those paths will be more stable and you don't get
hot-potato swapping between two defaults.

And that in turn allows the Happy Eyeballs mechanisms to do their jobs
much better as they keep a history per host or prefix, they assume IPv6
/48's and IPv4 /24's from what I have seen, in some cases.


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