Re: New I-Ds on ftp.bucknell.edu

["Edie E. Gunter" <[e-mail]>]

   Sorry if this is a duplicate...the bucknell mailer bounced
	it back to me.


> 1.  What is the rationale for allowing both the client and server to
> 	initiate updates to the A RR record?  Is it simply for the
> 	client to get confirmation of the change?

Normally, one thinks of a client as owning its name.  This
ownership, then, suggests that it is more logical for the
client to perform name->IPaddress (A RR) updates.

There is also the more practical issue of mobility.  If a
user takes his PC to another site in another
town or country, that user will probably want a local IP
address, but will want to keep his same name.  In this
case, the user/client is more likely to know the DNS
server to which the A RR update should be sent than a DHCP
server in a far away place.

> 3.  Even if the suggested option is maintained, I'd still favor
> 	having the servers submit all updates as this simplifies the
> 	protocol specifications immensely by eliminating the need for
> 	the flag within the option and answering the first discussion
>	question as to whether a server can override the client.

I would disagree.  In particular, I think in a secure DNS,
having DHCP servers update A RRs would make management of
the KEY next to impossible for the case where a PC moves
among multiple domains.

> 4.  I'm unclear as to why one would include lease information within
>	DNS. < stuff deleted >

DNS needs to know the lease expiration so that it can ensure
that the A/PTR RR's expire when the DHCP lease expires.  On
renewal of a lease, a client and/or server will send updates
to DNS.  This will effectively extend the expiration of the RRs.

> 	It seems a simpler approach would be to require a packet be
>	sent to DNS whenever a lease expires or is released by the
>	client. <more stuff deleted>

Waiting until the lease expires isn't going to work in a secure
DNS.  The expiration of the A/PTR RR's must be set up when the
RR's are added/updated.  Making the expiration arbitrarily far
into the future, assuming you'll be told when a lease expires or
when it's been released doesn't seem like a good idea to me.

Edie