Is this a change Cisco recommended, or more like an experiment that worked? Just wondering...
Lee H. Badman Wireless/Network Engineer Information Technology and Services Syracuse University 315 443-3003 Sent from a device that is much nicer than your Blackberry or iPhone -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Garry Peirce Sent: Thursday, October 15, 2009 12:22 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs Under WCS, within the 802.11b/g or A Parameters, it's called: 'Dynamic Tx Power Control'. On a controller, it's under: Wireless...802.11a...Network...DTPC support. Via CLI: 'config 802.11a dtpc' -- > -----Original Message----- > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > [mailto:wireless-...@listserv.educause.edu] On Behalf Of Bob Richman > Sent: Thursday, October 15, 2009 12:02 PM > To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs > > Can you tell us the 'show command' or where in the GUI you find if this > is set? Is it per wlan or AP? > > > -----Original Message----- > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > [mailto:wireless-...@listserv.educause.edu] On Behalf Of Garry Peirce > Sent: Thursday, October 15, 2009 11:36 AM > To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > Subject: Re: [WIRELESS-LAN] Self-assigned IP on Macs > > We also use Cisco and were seeing this issue earlier. It appears to > have > been significantly decreased after I disabled the IPTheft exclusion > policy > in lieu of Apple's aforementioned DHCP adherence to RFC4436. > > On Cisco controllers, the capability described below appears to be > called > 'Dynamic Tx Power Control DTPC' > "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.)" > > It is enabled by default (at least in 6.0.182). > Given Jeff's message below I'm thinking of disabling it. > Is there any further info on this Broadcom driver bug/status? > > -- > > > > > > -----Original Message----- > > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > > [mailto:wireless-...@listserv.educause.edu] On Behalf Of Jeffrey > > Sessler > > Sent: Wednesday, October 14, 2009 4:00 PM > > To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > > Subject: Re: [WIRELESS-LAN] 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. > > > > 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 > > > > === > > > > 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 > > > > === > > > > > > Anthony Croome > > QUT > > > > > > -----Original Message----- > > From: The EDUCAUSE Wireless Issues Constituent Group Listserv > > [mailto:wireless-...@listserv.educause.edu] On Behalf Of Earl > Barfield > > Sent: Friday, 28 August 2009 11:39 PM > > To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU > > 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... > > > > > > 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. > > > > 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. > > > > > > -- > > Earl Barfield -- Academic & Research Tech / Information Technology > > Georgia Institute of Technology, Atlanta Georgia, 30332 > > Internet: earl.barfi...@oit.gatech.edu e...@gatech.edu > > > > ********** > > Participation and subscription information for this EDUCAUSE > > Constituent Group discussion list can be found at > > http://www.educause.edu/groups/. > > > > ********** > > Participation and subscription information for this EDUCAUSE > > Constituent Group discussion list can be found at > > http://www.educause.edu/groups/. > > > > ********** > > Participation and subscription information for this EDUCAUSE > > Constituent Group discussion list can be found at > > http://www.educause.edu/groups/. > > ********** > Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/. > > ********** > Participation and subscription information for this EDUCAUSE > Constituent Group discussion list can be found at > http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
