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RE: Comments on draft-yourtchenko-colitti-nd-reduce-multicast

"Hemant Singh (shemant)" <shemant@cisco.com> Fri, 21 February 2014 20:07 UTC

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From: "Hemant Singh (shemant)" <shemant@cisco.com>
To: Ole Troan <otroan@employees.org>
Subject: RE: Comments on draft-yourtchenko-colitti-nd-reduce-multicast
Thread-Topic: Comments on draft-yourtchenko-colitti-nd-reduce-multicast
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Date: Fri, 21 Feb 2014 20:06:58 +0000
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Cc: Erik Nordmark <nordmark@acm.org>, "Andrew Yourtchenko (ayourtch)" <ayourtch@cisco.com>, 6man WG <ipv6@ietf.org>
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Ole,

-----Original Message-----
From: Ole Troan [mailto:otroan@employees.org] 
Sent: Friday, February 21, 2014 2:37 PM
To: Hemant Singh (shemant)
Cc: Erik Nordmark; 6man WG; Lorenzo Colitti; Andrew Yourtchenko (ayourtch)
Subject: Re: Comments on draft-yourtchenko-colitti-nd-reduce-multicast

>there is no ambiguity. see the conceptual sending algorithm in section 5.2, RFC4861.
>a prefix with the L flag = 0 is not added to the Prefix List. if the Prefix List is empty all packets will be sent to the default router, apart from packets destined to fe80::/10.

Thanks for this clarification - agreed.   Without any specific rules, if conceptually one thinks about ARP and ND and deems the default is off-link, then the decisions are very simple.  The algorithm for either ipv4 or ipv6 is deterministic in that if the algorithm cannot make a clear on-link determination, the algorithm defaults to off-link which implies sending traffic to the default router(s).  Only when clear indication of on-link exists, an address resolution NS is issued.

Hemant

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