Re: Comment on draft-jeong-hmipv6-dns-optimization-01.txt

["Jaehoon Jeong" <paul@etri.re.kr>]

After thinking about your comments, I became to agree with you.
Right, I'll let it a part of network admin to maintain the list of RDNSS.
I will modify my draft, reflecting Scott's and Luc's comments.
Thanks a lot.

Jaehoon

----- Original Message ----- 
From: "Scott Rose" <scottr@nist.gov>
To: "Jaehoon Jeong" <paul@etri.re.kr>
Sent: Tuesday, June 24, 2003 9:54 PM
Subject: Re: Comment on draft-jeong-hmipv6-dns-optimization-01.txt


> 
> My main concern is that maintaining the list of RDNSS seems to be an
> operational concern, and not really a part of the protocol extensions the
> draft describes.   It is not really important how a network keeps the list
> of DNS servers current, there are many options for a network admin to use
> depending on how the network is configured.
> 
> It would be enough to say that the MAP should take action to keep the list
> of RDNSS up to date, but not mandate how that is done.  That can be left as
> an operational concern for an individual network.
> 
> Scott
> 
> ----- Original Message ----- 
> From: "Jaehoon Jeong" <paul@etri.re.kr>
> To: "Scott Rose" <scottr@nist.gov>
> Cc: "DNSOP WG" <dnsop@cafax.se>
> Sent: Tuesday, June 24, 2003 1:02 AM
> Subject: Re: Comment on draft-jeong-hmipv6-dns-optimization-01.txt
> 
> 
> > Hi, Scott.
> > Thanks for your good comments.
> > Look at the inlines.
> >
> > ----- Original Message ----- 
> > From: "Scott Rose" <scottr@nist.gov>
> > To: <paul@etri.re.kr>
> > Sent: Monday, June 23, 2003 11:00 PM
> > Subject: Comment on draft-jeong-hmipv6-dns-optimization-01.txt
> >
> >
> > >
> > > I was reading over the draft and had a question regarding section 7
> > > Detection of RDNSS Failure:
> > >
> > > Why does the MAP need to check the state of the recursive DNS servers?
> If
> > > they are all part of the same administrative domain, an operator will
> make
> > > sure the DNS servers are up and running.
> > >
> >    The reason MAP checks  recursive DNS servers' state is to let MAP
> announce
> >    only  the living or reachable DNS servers.
> >    As you say, network operator can make sure the DNS servers within the
> managed domain
> >    are working in order. But until some DNS servers are down or out of
> order and
> >    the network administrator handles the problem, MAP will continue to
> announce the invalid DNS servers.
> >
> > > A client can also choose to ignore a recursive DNS server that it
> believes
> > > to be down.  If it sends out a DNS query, but does not recieve a reply,
> it
> > > can mark the server as "bad" or delete the server from its list of
> recursive
> > > servers to query.
> > >
> >    Though a client can detect some DNS server, it will take a time to
> detect.
> >    I intended to reducing the detection time by MAP polling DNS servers
> regularly.
> >
> > > I think it adds complexity for the MAP to ping every recursive DNS
> server
> > > unless there are a number of unstable DNS servers on a network.
> > >
> >    Yes, you are right when MAP often checks the DNS servers.
> >    If MAP pings every DNS server at appropriate intervals, I think,
> >    there is not much complexity.
> >
> >    I'd like to listen to other opinions.
> >    Thanks :-)
> >
> >    Regards,
> >    Jaehoon
> >
> > > Scott
> > > =================================
> > > Scott Rose
> > > Adv. Network Technology Div., NIST
> > > http://www.antd.nist.gov/proj/dnssec
> > >
> > > ph - 301-975-8439
> > > ==================================
> > >
> 

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