Re: IPv6 and Dynamic DNS

[Jim Bound <bound@ZK3.DEC.COM>]

> I have a really dumb question about all this.

This is a smart question and we need more of them.

> Consider this situation:
>
> My laptop is tomslaptop.mycompany.com.
>
> I visit SomeoneElse, Inc. and plug my laptop into their network and use
> autoconf or DHCPv6 to get an address.

Ah the real world.  This will be really happening. 

> What should I expect as my FQDN?  Is it tomslaptop.someoneelse.com or
> should I expect the right DNS updates to maintain my name as
> tomslaptop.mycompany.com.

If your lap top supports dyn upds dns when you get addrconf address you
can provide a name to go with your new address within the zone the master
server resides in where your located.  So when send in your address 
7dde::1 you would also provide the name you want to use based on the
zone suffix in your DNS config.  So if your DNS suffix config is
SomeoneElse.com for who you are visiting you would send along
tomslaptop.SomeoneElse.com as your name for 7dde:1.  If the name is
taken you will get a dyn upd dns error code to your dyn upd dns
implementation on your laptop.  Or you could get your not authorized, or
the server is down...etc... see RFC 2136.

Now if you use DHCPv6 you can still request what you did above OR ask
the DHCPv6 server to provide you a name.  The same rules apply above to
the DHCPv6 server.  Or the DHCPv6 server could be configured to just
give you a FQDN with your new address when you get it.  That can't be
done with addrconf.  

/jim