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Hemant, That is fine if only hosts are connected
to the CM. If the CM is connected to a cheap CPE router, then the router seen
the CM on one link (its default route out) and the hosts attached to it on
other links. In the case where there are hosts connected to an integrated
Ethernet hub and via WiFi, there will be two downstream broadcast domains in
the home that cannot hear each otherâs ND messages. As a result, for SLAAC to
work, the cheap CPE router must have two /64 prefixes assigned to it or a /63
assigned to the CMTS virtual interface connected to the CM. Am I missing something? Best Regards, (301) 448-6965 (mobile) From:
Hemant Singh (shemant) [mailto:shemant@cisco.com] Could
be VLAN like one has L2 VPN in the cable specifications. But L2 VPN
will limit one to 1024 max per cable line card on a CMTS â itâs a
very limited for services arch in cable and I donât think deployed very
widely. The point is a cable modem receiver chip is built to send its
upstream data only to the CMTS and likewise receive data from the CMTS â so how
can two modems even talk to each other? The
link-local domain on the CMTS is also a well-defined and tied to a virtual L3
network interface that aggregates several physical cable network interfaces and
all the modems. As of Fall 2007, CableLabs in the U.S. that certifies
CMTS and CM equipment has certified more than one CMTS vendor for Docsis 3.0
IPv6 with ND Proxy support on the CMTS. I
will be in Hiroshima, so if anyone would like to understand the cable and CMTS
link-local model and mcast for ND in cable, please find me â I am hanging
out in 6man, v6ops, INT area and the like. Regards, Hemant From:
Dunn, Jeffrey H. [mailto:jdunn@mitre.org] Colleagues, I may be missing something, but it appears
that, in the cases described, the two hosts downstream of two separate cable
modems are off link to each other. This brings up the question: Do there two
cable modems constitute two virtual interfaces, like two VLANs on the same
physical router interface? If so, this is an architectural, rather than an
implementation, question. Thoughts? Best Regards, (301) 448-6965 (mobile) |