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Yes, in a cable deployment even if two cable modems (CM) in two
different homes on the same upstream physical layer to the Cable edge router (CMTS)
cannot talk directly to each other â they have to send their data to the CMTS
who then forwards the data to the other modem. ÂStill I am not convinced of
any implications for DAD in SLAAC? Without any loss of generality, I will only
refer to a CMTS for the rest of the discussion but the same is applicable to a
DSLAM (or whatever L3 router sits upstream of the DLAM as the first-hop IPv6
router). Since the CMTS sees all DAD messages from client in the downstream,
if the CMTS detects a dup, the CMTS sends a NA to the client - problem
solved.ÂÂ Of course, now the CMTS is doing ND Proxy which is already specified
in cable standards and implemented on Docsis 3.0 IPv6 CMTS routers. What did I
miss? If the BBF has any new multicast architecture for ND that I have
not accounted for, please send me your arch doc and I can look at it and reply
to that as well. Hemant From:
owner-v6ops@ops.ietf.org [mailto:owner-v6ops@ops.ietf.org] On Behalf Of Fred
Baker (fred) Gentlemen: I'm writing to you as the authors of RFCs 4861 and 4862. In
a past meeting, I think the one in March, an issue came up in Savi that has now
been brought to our attention in a formal manner. The problem is that in
certain access network technologies, notably DSL and I believe Cable Modem, the
connectivity between the CPE host or router and the ISP's first hop router is
siloed - it looks like an Ethernet to the host but in fact is separated into
separate channels. The effect is that while the ISP router can speak to and
hear all of the CPEs it is connected to, the CPEs cannot hear each other. This
has implications for Duplicate Address Detection in SLAAC. We look forward to your advice. Fred Baker IPv6 Operations Begin forwarded message:
From: Robin
Mersh <rmersh@broadband-forum.org> Date: November
6, 2009 1:42:05 AM GMT+08:00 To: fenner@fenron.com, christian.vogt@ericsson.com, fred.baker@cisco.com, kurtis@kurtis.pp.se, dromasca@avaya.com, rbonica@juniper.net, rdroms@cisco.com, jari.arkko@piuha.net, Mark Townsley <townsley@cisco.com> Subject: Broadband Forum liaison to IETF on IPv6 security Dear colleagues, For your review, please see the liaison from the Broadband
Forum attached below. Best regards, Robin Mersh COO The Broadband Forum phone: +1 336 288 8013 cell: +1 303 596 7448 email: rmersh@broadband-forum.org
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