On 09/14/2017 12:34 PM, Denis Kenzior wrote:
Hi Johannes,
On 09/14/2017 02:17 PM, Johannes Berg wrote:
On Thu, 2017-09-14 at 13:37 -0500, Denis Kenzior wrote:
The question is whether all APs are actually sane after a
roam. E.g. can the STA assume that the same IP address, DHCP lease,
etc is still valid? I heard from various people that this might not
be the case, but we haven't had a chance to verify those claims...
I think you pretty much have to assume that, otherwise there's no point
in roaming at all - you want your connections to stay, possibly voice
calls to continue, etc.
I'm all for using this assumption. I just wonder if real world disagrees? :)
There are different meanings for 'roam'. Are you just talking about
fast-transition roaming?
I would think that the decision to restart DHCP (at least ipv4) should
be in user-space. I'm less sure about how IPv6 should deal with this.
I have tested roaming using FT and normal-ish wpa_supplicant without
doing DHCP, and it works fine. Of course, it also works if you
choose to re-do DHCP.
Thanks,
Ben
However, I'm not really convinced (any more) that this is actually
correct. If I'm reading the supplicant code correctly, then it sets
IF_OPER_UP only once the connection is *completed*, so it's already
doing what I thought it should be doing and couldn't.
Yes. For a new connection it does something like:
New Key
Set Key
New Key (group)
Set Station (Authorized) (which fails on some drivers)
Set OperState to UP
Regards,
-Denis
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
