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RE: [dhcwg] dhcpv6-24: use of anycast

"Bound, Jim" <Jim.Bound@hp.com> Mon, 13 May 2002 02:36 UTC

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Subject: RE: [dhcwg] dhcpv6-24: use of anycast
Date: Sun, 12 May 2002 22:35:21 -0400
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Thread-Topic: [dhcwg] dhcpv6-24: use of anycast
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From: "Bound, Jim" <Jim.Bound@hp.com>
To: "Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se>, Ralph Droms <rdroms@cisco.com>
Cc: Thomas Narten <narten@us.ibm.com>, Ole Troan <ot@cisco.com>, dhcwg@ietf.org
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Bernie,

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I don't think the link-scoped unicast address is a good idea. What would the prefix for this be? If it is the standard link-local prefix, what about all the hosts today that don't have code to check for this value.
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The client dhcpv6 code only needs know the address.  It does not affect IPv6 networking implementations at all.  And even if it was anycast thats handled by mgmt interface for the address set.

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I think we're best left with letting this issue be resolved by the first link that needs it (as Thomas originally suggested).
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I agree with Thomas if anycast is used just use the first listner.  But we have an issue maybe and do with anycast right now.  What Ralph proposes works with well-known-unicast, anycast, or well-known-multicast as I suggested.  And it don't break anything.

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So, perhaps we should simply say: 
"If the link supports multicast, the multicast address MUST be used. Otherwise, the link over IPv6 specification needs to specify what the DHCP Client must use."
**********************************

I don't agree Ralphs suggestion is more clear, easy to implement, and fits the IPv6 architecture well.

thanks
/jim


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