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

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

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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