RE: [dhcwg] dhcpv6-24: sending Information-request via multicast

"Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se> Wed, 08 May 2002 16:22 UTC

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From: "Bernie Volz (EUD)" <Bernie.Volz@am1.ericsson.se>
To: 'Thomas Narten' <narten@us.ibm.com>, dhcwg@ietf.org
Subject: RE: [dhcwg] dhcpv6-24: sending Information-request via multicast
Date: Wed, 08 May 2002 11:19:40 -0500
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Yes, this same issue has given us some concern in 3G standardization.

Link-local multicast is always safe to use (but does require a Relay). The general multicast issue for non-link local still haven't been fully resolved (at least to my understanding), so using a site scoped multicast address is potentially a problem until general multicast support is wide-spread.

I'd recommend we require the use of the link-local multicast and remove the ability to send the Information-Request to the site scoped multicast.

- Bernie

-----Original Message-----
From: Thomas Narten [mailto:narten@us.ibm.com]
Sent: Wednesday, May 08, 2002 11:08 AM
To: dhcwg@ietf.org
Subject: [dhcwg] dhcpv6-24: sending Information-request via multicast


>    If the client has an IPv6 address of sufficient scope, the
>    client MAY choose to send the Information-request message to the
>    All_DHCP_Servers multicast address.

This MAY leaves things very ambiguous. When should they do this? When
not?  It would be much better to have a clear algorithm the client
always follows. Otherwise, you'll get different implementations doing
different things, which is probably not good for interoperability.

Thomas

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