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Re: [69ATTENDEES] DHCP

On 2007-09-13 18:56, Gert Doering wrote:

Hi,

On Thu, Sep 13, 2007 at 03:46:31PM +0900, Jun-ichiro itojun Hagino wrote:

	i agree that vendors would implement whatever they would need to, but
	iirc the group is here to give guidance for operations.


... and to listen to operators, to avoid giving guidance that completely
misses the target.


	the primary issue with DHCP-based address assignment is the requirement
	for DHCP server to keep state.  due to this, major DHCP server
	implementation suffers from reading in lease database when it reboots
	(stops for 5 minutes).  DHCP server is a single point of failure.

	with RA-based address autoconfiguration and DHCPv6-lite based stateless
	DNS server address passing, there's no need for keeping state in the
	server side, hence there's no single point of failure.
We just don't want to run yet another service that could fail, needs configuration, and possibly debugging if client machines are unhappy. 

Routers are there, so RAs are there anyway.  DHCP is an extra.


As far as I can see, in a minimal ("dentist's office") scenario,
the one thing a host must have in addition to addressing and
routing info is DNS servers. Since auto-configuration was
explicitly designed to support the minimal scenario, it seems
entirely rational to add DNS server info to RA. On the other hand,
DHCP can support dozens of additional features, and we surely
shouldn't import that level of complexity into RA.

     Brian