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
_______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf