Big Temporary Networks
mohta at necom830.hpcl.titech.ac.jp
Thu Sep 20 01:24:03 UTC 2012
William Herrin wrote:
> I think Masataka meant to say (and said previously) that the DHCP
> request from the wifi station is, like all packets from the wifi
> station to the AP, subject to wifi's layer 2 error recovery. It's not
> unicast but its subject to error recovery anyway.
But, as I already wrote:
1) broadcast/multicast from a STA attacked to an AP is
actually unicast to the AP and reliably received by the
AP (and relayed unreliably to other STAs). That is, a
broadcast ARP request from the STA to the AP is reliably
received by the AP.
Because of hidden terminals, L2 broadcast/multicast is transmitted
only from AP.
>> However, at WiFi L2, it is first unicast to AP and then broadcast
>> by the AP.
> Your use of nomenclature is incorrect. It'd be like saying my ethernet
> card unicasts a packet to the switch and then the switch broadcasts it
> out all ports. Or like saying that a packet with an explicit MAC
Do you know MAC header of 802.11 contains four, not just source
and destination, MAC addresses?
Because of hidden terminals and because of impossibility of
collision detection, WLAN is a little more complex than your
> No offense, but it is not for you or I or Owen Delong to declare that
> IPv6 is or isn't operational.
A single counter example is enough to deny IPv6 operational.
> whether and when IPv6 is sufficiently
> operational for their use.
The scope is not "their use" but "as a protocol for the entire
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