-----Original Message-----
From: Jared Mauch [mailto:ja...@puck.nether.net] 
Sent: Sunday, August 15, 2010 4:18 PM
To: Hemant Singh (shemant)
Cc: Randy Bush; ipv6 deployment prevention
Subject: Re: Router redirects in Node Requirements document


>Fixing DHCPv6 and adding prefix-length/mask seems a much more elegant
solution vs pushing redirect capability upon a large swath of devices.

I and Wes disagree with adding any prefix length to DHCPv6.  I believe
Wes gave the reason to 6man mailer during the past 3 years.  Rather than
spend time to fish out the email, here is the text Wes that captures the
gist of it.

"The reason I think one separated prefix length from ND RA and DHCPv6 is
that the router knows best what prefixes it can route to, and what is
on-link/off-link, etc., because the router is responsible for the
TOPOLOGY of the network.  The DHCPv6 server knows best who is authorized
to get an address, and what configuration information a client should
get, because it is the  CONFIGURATION/SECURITY authority. These are two
separate concerns, and it is best to keep them separate.  It's easier to
manage TOPOLOGY in a distributed fashion.  It's easier to manage
CONFIGURATION/SECURITY in a centralized fashion."

Hemant
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