ipv6 question

[Michael H. Warfield]

On Mon, 2011-01-03 at 11:00 -0500, Genes MailLists wrote: 
> On 01/03/2011 01:55 AM, Michael Cronenworth wrote:
> > On 01/02/2011 04:40 PM, Genes MailLists wrote:
> >>     How does one manage your internal ip6 network so that an ISP change
> >> (which under NAT/ipv4 is irrelevant) - is straightforward/clean to manage ?
> >>
> > 
> > At the moment I use radvd and update my DNS entries in my local bind server.
> > 
> > 

> Thank you - I gather radvd is a way to broadcast the ip6 prefix on the
> local segment so that the things like dns server can be found ?

Quagga is another alternative for router advertisements, particularly if
you are playing with any other routing protocols.

Router advertisements are not exactly broadcasts, as IPv6 has no
broadcast addresses at all.  Rather, they are multicast protocols and
multicast address groups.  A node actually requests, or solicits, a
router advertisement as a part of its address configuration process by
sending a multicast packet to the "all routers" multicast address on the
link.  The router responds.  The router also periodically sends
multicast packets to the "all nodes" multicast address, which serves the
same purpose as a local broadcast address, except it can't be abuse by
outside networks like directed broadcasts can.

> Off to read man page for radvd .. :-)

DNS, particularly if you are doing things like providing reverse DNS
lookups for your addresses, can get pretty groady but a few scripts can
put a leash on that problem and dhcp6 can handle that as well.  Your
addresses you put in the DNS are not going to be pretty because they'll
be derived from the ethernet mac addresses plus the prefix.  But
changing a prefix isn't too bad because the lower half the address
DOESN'T change, just a global search and replace and you're done.

Regards,
Mike
-- 
Michael H. Warfield (AI4NB) | (770) 985-6132 |  mhw at WittsEnd.com
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