I don't think bridging should be considered for homenet. Don't forget
the following in the charter:
"Also, link layer networking technology is poised to become more
heterogeneous, as networks begin to employ both traditional Ethernet
technology and link layers designed for low-powered sensor networks."
In a lot of these conversations, the "lightswitch guys" (as someone
called the LLN proponents) seem to get forgotten.
So what happens if the "lightswitch guys" want to plug-in a router,
which they have to, as they can't bridge, but there's only one exit
router from one ISP which is managed and gets a /64 only?
SLAAC relay? I think in this case a /64 is simply not acceptable.
OK, so there are failure cases and that too needs to be stated in the
architecture. Send text.
So your text:
The home network needs to be adaptable to such ISP policies, and thus
make no assumptions about the stability of the prefix received from
an ISP, or the length of the prefix that may be offered. However, if
only a /64 is offered by the ISP, the homenet may be severely
constrained. Attempting to use subnet prefixes longer than /64
would break SLAAC, and is thus not recommended. Using ULA prefixes
internally with NPTv6 at the boundary would be possible, but is not
recommended for reasons given elsewhere. The least damaging solution
would be for the internal routers to revert to bridging mode,
even though this would destroy the benefits of subnetting.
might become:
The home network needs to be adaptable to such ISP policies, and thus
make no assumptions about the stability of the prefix received from
an ISP, or the length of the prefix that may be offered. However, if
only a /64 is offered by the ISP, the homenet may be severely
constrained. Attempting to use subnet prefixes longer than /64
would break SLAAC, and is thus not recommended. Using ULA prefixes
internally with NPTv6 at the boundary would be possible, but is not
recommended for reasons given elsewhere. The least damaging solution
would be for the internal routers to revert to bridging mode,
even though this would destroy the benefits of subnetting.
There are cases where neither bridging mode nor NPTv6, nor DHCPv6
are feasible, e.g. if there are LLN subnets within the homenet
which require remote access. In such cases a /64 assignment from
an ISP will break the home network, and should therefore be avoided.
Feel free to rewrite it.
Mat
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