167RE: [bacnet-ip-wg] Asked an IT person about IPv6 multicast
- Aug 22, 2011
Thank you for doing this research.
It seems that the answer, though, didn't really address the multicast issue. Perhaps I'm missing something? IPv6 requires all routers to support link-local multicast which is what is used primarily by B/IPv6. In other cases, organization scope multicast is used. In the case where multicast is disabled, then a B/IPv6 BBMD is required.
I'm confused by the "worst case scenario" that is listed:
"Therefore consider the worst case scenario whereby the entire IT managed infrastructure only supports IPv4 routers, DNS (A records only), and NATs."
That sounds to me like an environment where IPv6 isn't even deployed. Why would BACnet/IPv6 be rolled out in this environment, then?
6to4 tunnels/servers are specialized pieces of equipment which require special configuration in the same way a NAT requires special configuration. In my mind, and again I might be missing something, this scenario is solved in BACnet by BACnet routing. In the case where you'd want a B/IPv6 network to communicate with B/IPv4 devices you'd use a B/IPv6 to B/IPv4 router which would get configured the same as, say, an MS/TP to B/IPv4 router. But, a B/IPv6 site deployed over IPv4 infrastructure doesn't seem like a viable option.
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