Re: IPv6 and Dynamic DNS

[Dean Anderson <dean@av8.com>]

It is usually tomslaptom.someoneelse.com.  At least, it has been in the
last 20 or so companies over the last 4 years that I've plugged into with a
travelling laptop. You get your connectivity from them. They give you a
name to use, too. 

But clearly this is a potential application for dynamic update.  My
emphasis on Potential.  DNS gives you functionality without policy.  You
define policy.

Since you own mycompany.com, you control its update and whether you do
dynamic update.  So the machine could potentially have 2 names, and its
quite likely that its reverse DNS will be off, but consistent enough for
applications like mail.  Especially if mycompany.com does dyn update and
someoneelse.com or their ISP doesn't.

And the laptop name often doesn't include the domain name, at least for MS
machines.  Remember the bad update thread of several weeks/months ago where
the desktop updates DNS with the same name as a server.

		--Dean

Around 12:04 PM 8/10/1999 -0700, rumor has it that Terry Lambert said:
>Tom Limoncelli wrote:
>> 
>> I have a really dumb question about all this.
>> 
>> 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.
>> 
>> 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.
>
>Unless you sold your laptop to SomeoneElse, Inc., I think
>it should retain its True Name (emphasis intentional).  That
>is, it should remain tomslaptop.mycompany.com.
>
>While most of the paranoia on this question ("the travelling
>laptop problem") has been directed to "protecting" your DNS
>from containing reverse mappings for addresses that are in
>your zone of responsibility (and which you are routing),
>there is a real issue with your laptop being fooled into
>sharing its resources (including its network accessible
>filespace) with other machines at SomeoneElse, Inc..
>
>I think that this _requires_ that your laptop retain its
>True Name.
>
>
>> Note: I'm not asking about reverse lookups.  Depending on the
>> answer to the question above I have different questions about
>> reverse lookups.
>
>Probably the same as my question, only I assumed the above
>as a posit, when maybe I should have stated it as an assumption,
>like your question does.  8-).
>
>
>-- Terry Lambert
>-- Whistle Communications, Inc., an I.B.M. Company
>-- terry@whistle.com
>-------------------------------------------------------------------
>This is formal notice under California Assembly Bill 1629, enacted
>9/26/98 that any UCE sent to my email address will be billed $50
>per incident to the legally allowed maximum of $25,000.
>
>
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           Plain Aviation, Inc                  dean@av8.com
           LAN/WAN/UNIX/NT/TCPIP          http://www.av8.com
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