Hi
Greg,
thanks for your reply.
Please read my inline comments.
[LONGMAN DICTIONARY] rhetorical question -- a question that you ask as a way of making a statement,
without expecting an answer, such as `Who knows what might happen?'
Cheers,
Paul
Greg Daley wrote:
If the STA is
going to perform a reachability test in any case,
If the station have discovered the *prefix(es)* associated with an AP
earlier during its neighborhood discovery phase, and assuming that it
finally associates with this AP, do you think *reachability test* is
necessary ?
I
think it is necessary, because the configuration's presence
on the AP doesn't mean that the router is up, reachable or
working correctly.
True.
Pardon me, I did not try to associate reachability with received
broadcast beacons.
There's a WLAN
accesspoint down the corridor from me which is
a black hole for people walking past it accepts their connections
and then doesn't route. Why? because there is no ethernet plugged in.
Interesting!
Also the
reachability based on reception of broadcast beacons
is not sufficient to determine that the AP can hear your transmissions.
Probe-Request/Response may work, as will authentication,
but not passive beacon reception.
AFAIK,
in an infrastructure mode, station can communicate with the AP which is
always ONE-hop away. The link is always bi-directional, right ? Beacons
are broadcasted at a lower rate, thus travelled further. Therefore,
stations should be able to communicate (both ways) with AP.
what is the
functionality of learning the possible prefixes?
As
I specified in my draft, the original purpose of these *advertised
prefix(es)* is to enhance Movement Detection operation. There might be
other possible use-cases ...can I pre-configure/verify a CoA (plus DAD)
for this prefix in advance or maybe *initialise* a fast-handoff
operation.
I don't think so.
A lot of people have tried to get this (a way around DAD using
network state). It's quite hard to do.
Do you
think it would be nice to have this capability ? Maybe, we did not try
hard enough. 8-)
Is it worth
having a standard way to provide this
information, so that we can guarantee that it gives a
strong hint?
Perhaps, but I think that such a protocol looks like
something able to be better handled by CAPWAP than DNA.
Not
sure about CAPWAP. WIll read about it. Ok, I will see how this goes.
|