This is the first I have heard of this issue, but v5 of the Cisco Wireless
LAN Controller Configuration Guide says that "world mode" = DTPC
-------------------
Enabling Dynamic Transmit Power Control
When you enable Dynamic Transmit Power Control (DTPC), access points add
channel and transmit power information to beacons. (On access points that
run Cisco IOS software, this feature is called world mode.) Client devices
using DTPC receive the information and adjust their settings automatically.
For example, a client device used primarily in Japan could rely on DTPC to
adjust its channel and power settings automatically when it travels to Italy
and joins a network there. DTPC is enabled by default.
Enter this command to disable or enable DTPC:
config {802.11a | 802.11bg} dtpc {enable | disable}
-------------------
v6 of the guide does not use the word "world mode" and only uses the term
DTPC. I can verify it is on by default in v6 of WCS.
http://www.cisco.com/en/US/docs/wireless/controller/6.0/configuration/guide/c60ccfg.html#wpmkr1316123
Mark
Date: Wed, 14 Oct 2009 12:59:53 -0700
From: Jeffrey Sessler <j...@scrippscollege.edu>
Subject: Re: Self-assigned IP on Macs
Are the Macs in question associating at 802.11a/n (5GHz)? I've posted =
before about a bug in the Mac Broadcom driver which will cause the client =
to continuously adjust it's power and may result in an association to the =
AP but random communication issues (like failure to get an IP). Cisco =
added a command to disable the World Mode IE feature in the beacons until =
Apple fixes the problem.
config 802.11a(or 802.11b) world-mode disable
I think the above is in 5.2.193 but I'm not sure if it made it into 6.0. I =
believe however that there is an equivalent individual AP cli command for =
it.
Oh, and world mode IE is disabled by default on Cisco autonomous AP's, =
thus you'll likely not encounter the issue with them.
Jeff
>>> Anthony Croome <a.cro...@qut.edu.au> 10/13/2009 9:30 PM >>>
Hi
We are having this problem too. Is there any new information from people?
We currently run Cisco wireless and have upgraded some locations to the =
new N standard. =20
The problem "appears" to be isolated in the locations where we have =
upgraded but we can't be 100% sure.
It is only appearing on macs, and they claim it works in one place but not =
another. All we can see is that it appears to be rejecting the dhcpoffer =
from the dhcp server.
We haven't tried disabling dhcp proxy as discussed earlier in this thread, =
but others have said it didn't help.
The latest temporary solution that has worked on two out of two macs is
=3D=3D=3D
All commands required at the command line:
sudo ipconfig set en1 BOOTP (case sensitive and en1 is generally the =
wireless adapter on macs but it could possibly be different?)
wait 5 seconds and then enter:
sudo ipconfig set en1 DHCP
=3D=3D=3D
Anthony Croome
QUT
-----Original Message-----
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIREL=
ess-...@listserv.educause.edu] On Behalf Of Earl Barfield
Sent: Friday, 28 August 2009 11:39 PM
To: wireless-...@listserv.educause.edu=20
Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs
> Date: Thu, 27 Aug 2009 15:58:39 -0500
> From: Hector J Rios <hr...@lsu.edu>
> Subject: Self-assigned IP on Macs...
>=20
> Have you guys run into this issue? We run Cisco's lightweight APs on
> WiSMs running code 5.2.193. Mac will associate to our APs but just won't
> obtain an IP address. In the end it assigns itself a self-assigned IP.
> We are seeing this on a lot of new MacBooks and MacBookPros running
> 10.5.8. If we associate the computer to an autonomous AP it works fine.
> If we boot it in safe mode it works fine too. Everything else it just
> fails.=20
I had the same problem after ugrading from 4.2.<something> to 5.2.193.0.
Uncheck "Enable DHCP Proxy" under controller->advanced->DHCP and see if
that fixes it. It worked for me.
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