Tim Chown wrote:
IPv6 is defective in so many ways. But, w.r.t. WLAN, here is the
reason.
Could you describe why exactly IPv6 can't run on the (layer 2?) WLAN
infrastructure?
That ND extensively, without any valid reason to do so, use
multicast, which is not acknowledged at WLAN L2, means IPv6
or its ND is unreliable over congested WLAN. If multicast
ND packet is lost by congestion, it is not retransmitted by L2.
MIP failed mostly because there has been no standards MIP over
link technologies, which are adaptation layers between L2 and L3.
RFC2002 does not specify anything about how CoA addresses can
be obtained, which is fine, if and only if there are other
specifications on link or provider dependent ways to do so.
IPv6 made it worse by trying to standardize ND as *THE* adaptation
mechanism, even though the mechanism *MUST* depend on details of
L2 and *MUST* be different L2 by L2.
As a result, IPv6 won't stably run over WLAN, multicast over which
has characteristics much different from wired Ether.
Masataka Ohta
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