turning on comcast v6

Lee Howard Lee at asgard.org
Mon Dec 30 20:49:09 UTC 2013

I'm not really an advocate for or against DHCP or RAs.  I really just want
to understand what feature is missing.

From:  Blake Dunlap <ikiris at gmail.com>
Date:  Monday, December 30, 2013 3:19 PM
To:  Ryan Harden <hardenrm at uchicago.edu>
Cc:  Lee Howard <Lee at asgard.org>, Jamie Bowden <jamie at photon.com>,
"nanog at nanog.org" <nanog at nanog.org>
Subject:  Re: turning on comcast v6

> The better question is are you using RIP or ICMP to set gateways in your
> network now?

I disagree that that's a better question.
I'm not using RIP because my hosts don't support it (at least, not without
additional configuration), and it would be a very unusual configuration,
adding weight and complexity for no benefit.  RAs are the opposite.
Not even sure how you would use ICMP to set a default gateway.  Maybe
there's a field I'm unaware of.

> If you don't use those now, why is RA a better solution in ipv6?

It's built into the fundamentals of IPv6, using the Neighbor Discovery
Protocol.  It's supported in every stack.  It's the default mode of
operation.  To turn it off, you have to disable part, but not all, of NDP.
(Do you also turn off RSs on all hosts?)

There could be better solutions; I would like to understand how they are
better.  Again, in your network, you can do whatever you want.  If you want
something different standardized, then you need consensus here:


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