Re: Re: Prefix Delegation using ICMPv6

>From: Ole Troan <ot@cisco.com>
>Date: 2006/08/23 Wed AM 12:57:16 CDT
>To: Syam Madanapalli <smadanapalli@gmail.com>
>Cc: IETF IPv6 Mailing List <ipv6@ietf.org>
>Subject: Re: Prefix Delegation using ICMPv6

>I don't understand the rationale for this work either.

Hi Ole, thanks for the reply. Sorry it took me so long to get back to you.

>
>the first PD proposal (by Brian Haberman) was indeed based on using
>ICMP as transport. separate message types instead of
>piggy-backing on RS/RA though.

Yes, absolutely. The Haberman draft is just one of three such docs of which I'm aware:

1.draft-haberman-ipngwg-auto-prefix-02.txt
2.draft-bykim-ipv6-hpd-01.txt
3.draft-arunt-prefix-delegation-using-icmpv6-00.txt

>as we continued to develop that
>mechanism we realised that we were pretty much reinventing the DHCP
>protocol machine. that realisation led to specifying it as an DHCP
>option instead of as a new protocol.

I see what you're saying. I should say that our proposed PD mechanism is more representative of the extension of RS/RA functionality than the creation of an entirely new protocol.

>
>a technical comment on your proposal; how do you plan to support
>shared links with multiple requesting routers?

Have you had an opportunity to read our proposal in its entirety? Here is a cut from our text (section 4, page 5) which I hope will answer that question:

"There may be cases where more than one DR is present on the link shared with the RN.  In cases such as this, the RN will choose as its DR the PD capable router whose solicited RA it received first.

Subsequent RAs received from the remaining on-link PD-capable routers will be ignored."

>RAs are typically multicast.

Yes and no. An unsolicited RA is typically multicast, whereas a solicited RA would be unicast.

Best Regards,

Tim
Rom 8:28

>
>/ot
>
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