Roaming between 802.11a & g

Hi forum,
Can wireless clients roam seamlessly between 802.11a and 802.11g APs? they will be using the same SSID.
besides, if I select different channel for bluetooth clients, can it coexist with 802.11g?
Thank you,
paul

It is possible for a wireless client to roam between 802.11a and 802.11g.
Try this link:
http://www.cisco.com/warp/public/cc/pd/witc/ao1200ap/prodlit/index.shtml

Similar Messages

What's the difference between using and 802.11a and 5GHz only?

What's the difference between using "802.11n (802.11a compatible)" and "802.11n only (5GHz)" modes on the Airport Extreme?

802.11a gives you 802.11g speeds but using 5GHz (54mbps
802.11n gives you 144Mbps (600 peak) at 2.4GHz or 5GHz

802.11a/g/n optimizing for compatibility

How to ensure maximum client compatibility and stability in 802.11a/b/g/n networks?
I am running a Wireless network based on the WLC 5508 6 SW version, (with WCS mgmt) and 1142 APs. I would like a broad variety of clients, old G clients and new N clients to experience a stable connection to the network. I see Apple Macbooks, Lenovo-, Dell- and HP laptops in addition to HTC smartphones and iPhones on this network.
I am having issues with some types of clients experiencing "unstable" connections. They are able to get a link for a variable ammount of time, then suddenly loose connection for a short period of time before reconnecting. These clients mostly use a third party SSL-VPN link over my wireless, therefore the loss of connection can be quite annoying. From time to time some of these clients seem to be flapping between access points but not seamless like roaming should be, rather with a short stop in connectivity before reconnecting.
Previously we had a 802.11g Aruba wireless network in the same location. It had no such difficulties. This points me toward the config parametres in the controller.
Which 802.11 b/g/n and WLAN parameters can affect this? I am looking for a document describing a best practice for setting up these parameters, or if someone here has input to a successful stable setup as the configuration guide only says e.g. "Enable if you want Aironet Information Elements" does not help in deciding if I want this
My WLAN is set up with WPA2/AES PSK
and a guest network with web auth
Examples of parameters:
which Radio policy (bgn or gn)
Aironet IE?
MFP (disabled or enabled)
QoS profile?
can CCX location measurement affect performance?
Which Data rates should be set mandatory/enabled/disabled?
MCS (data rate) settings for 802.11n
anything I have forgotten?
The goal is:
A simple, no hassle network providing maximum compatibility with different clients with a plus of 802.11n speeds for compatible clients
wbr
-LA

Hey! I implemented your suggested improvements and the first impression is good!
on 802.11a and b/g I disabled lower datarates, set 12Mbps to mandatory and the higher ones to supported. The instant improvement was the RTT measurements I made (previously they averaged at about 13ms (to an internet site) after the change they dropped to about 3-4 ms on average! I would say this is a very significant improvement!
I have not been able to get any feedback from the user community yet :), but it sounds promising...
I am still looking for some more insight into these issues, so if someone still has some ideas, please let us know!
-LA

How to improve client handover and roaming between AP's

Improving client Handover and roaming between APs
There are a few standards and methodologies available to use to improve handover of clients between APs. Most are focused on VOIP technologies, but it must always be remembered that we cannot control the client Handover (especially with legacy clients) we can only encourage them. Some Standards and methods work well for some environments and some do not - test the recommendations extensively before implementing in a live Production environment. It must also be noted that all settings take effect immediately once applied, however from a client perspective it might need to re-associate for the changes to take effect client side.
As with everything else in IT, if a perfect method/solution existed there would only be one - try them all and keep the best.
The Standards and Definitions
802.11k
IEEE 802.11k allows a device to quickly identify nearby APs that are available for roaming. When the signal strength of the current AP weakens and the device needs to roam to a new AP, it will already know the best candidate AP with which to connect to.
802.11r
IEEE 802.11r specifies fast Basic Service Set (BSS) transitions between access points by redefining the security key negotiation protocol, allowing both the negotiation and requests for wireless resources to occur in parallel.
When a device roams from one AP to another on the same network, 802.11r streamlines the authentication process. BSS allows a devices to associate with APs more quickly. Coupled with 802.11k's ability to quickly identify the target AP, BSS's faster association method may enhance application performance.
Handoff Assist
The AP monitors the RSSI for every associated client. If the RSSI for a specific client falls below "low-rssi-threshold" and continues to fall for the "rssi-falloff-wait-time", then the AP will send a de-auth to the client.
The de-auth is meant to kick the client away from the current AP and get it to re-authenticate to a nearby AP. This will have the effect of helping a client handover between 2 APs.
BUT (Big But), if the client gets de-authed and takes a while to re-authenticate (if it even does re-authenticate automatically after a de-auth), then this will have the effect of destroying communication instead of helping it -- mostly found with legacy clients.
Remove Lower Transmit Rates
Removing lower transmit rates is a way to promote better roaming, BUT not all clients respond well, or even respond to it.
The practice is that the basic rates are a subset of the transmit rates. If you only want to allow speeds 9 and up, you would select only the transmit rates of 9 and up, and the basic rates of 9 and 11. If a legacy client expects the rates of 1 and 2 it will not connect.
Local Probe Threshold
Local probe Threshold prevents a client from connecting to an AP with a too low a signal - helps more with initial connection than roaming.
The local probe threshold parameter is not supposed to force clients to roam as soon as they pass near an access point with a good signal, but rather to NOT hold on to an access point with a weak signal (avoiding sticky clients).
PMK Caching
Defined by 802.11i and is a technique available for authentication between a single AP and a station. If a station has authenticated to an AP, roams away from that AP, and comes back, it does not need to perform a full authentication exchange. Only the 802.11i 4-way handshake is performed to establish transient encryption keys.
Opportunistic Key Caching (OKC)
Is a similar technique to PMK, but not defined by 802.11i, for authentication between multiple APs in a network where those APs are under common administrative control. An Aruba deployment with multiple APs under the control of a single controller is one such example. Using OKC, a station roaming to any AP in the network will not have to complete a full authentication exchange, but will instead just perform the 4-way handshake to establish transient encryption keys
Implementation and Configuration
802.11k
802.11k is configured in your VAP profile. Tick the option to “Advertise 802.11k”. There after set the Handover Trigger Feature Settings.
Tick the “Enable Handover Trigger feature” and then set RSSI threshold by specifying the -dBm level at what the hand over trigger should be sent to the client
802.11r
802.11r is configured under SSID of your VAP profile. Tick the option to “Advertise 802.11r”
HandofF Assist
Station Handoff Assist is enabled in RF Optimization under the RF Management section of AP configuration.
Tick the “Station Handoff Assist” option to enable it, next set the Low RSSI Threshold – the threshold determines above what level no deauth gets sent
Lower Transmit Rates
Transmit rates can be adjusted in the Advanced tab of SSID under your VAP profile.
Remember that the basic rates are a subset of the transmit rates. If you only want to allow speeds 9 and up, you would select only the transmit rates of 9 and up, and the basic rates of 9 and 11
Local Probe threshold
Local Probe threshold can be adjusted in the advanced tab of SSID under your VAP profile.
Depending on the density of your APs consider values between 20 and 40 -- 40 being aggressive in an AP dense area.
Deny Broadcast Probes
Denying Broadcast Probes can cause problems with Roaming especially if the SSID is hidden – leave option disabled.

Hi, thank you for the helpful guidance. I have a basic question, if the device roam from one AP to another AP with the same SSID. Is there a need of re-authentication given a) the network uses EAP based authentication; b) the network uses MAC address authentication. If there is no need of EAP re-authentication, how the 802.11 keys are moved to the new AP. Thank you very much if you could help me clarify my thought.

Roaming between E3000 wireless router and WAP300N

Hi all
The Linksys router I’ve got in my office room at home is providing poor coverage in my living room. Thus I’ve purchased a WAP300N and connected it by wire to the build-in 4 port switch of my Router (E3000). The set-up is providing a significant improvement in the living room, but… it seems as if the two wireless access points are “competing” over the “clients”.
When I move from the office room into the living room, my wireless equipment seems to be stuck on the connection to the wireless router in the office room – even though the signal from the WAP300N in the living room is much stronger.
The situation is exactly the same, when I move from the living room to the office room – the wireless equipment is stock on the weak signal from the living room.
I have to turn off and on the radio on my wireless equipment to get them to connect to the strongest signal.
Is there a way to make the “roaming” between wireless access points more smooth?
Kind regards
vonRasmussen

vonRasmussen :
Change the channel on the WAP or your router are on.
Not the 802.11?, but the transmission channels, which are probably transmitting on the same channel. I find the best results are at lease 2 numbers apart. if on is transmitting on channel 1 the next closest will be on 3. With multiple WAPs in a large area you would have to play Sudoko to make sure every one is 2 channels apart.
to quote Lisa Phifer:
Multiple access point configuration: Distinguish transmission signals;
Why should you access points use different channels? In a typical micro-cell Wlan, adjacent APs should always use non-overlapping channels, ( e.g., 1 ,6 ,11), to avoid co-channel interference.
Good Luck.
Dave

802.11A

Has anybody connected their MacBook Pro to an 802.11A router? The reason I ask is that currently my signal keeps on dropping out. I am using an Airport Extreme Base Station. The MacBook Pro wireless is much better then the Aluminum Powerbook which may be part of the problem. I am able to see more routers then before. Besides mine I see 2 Linksys Routers on channel 6, 1 Netgear Router on channel 11, 1 Unknown brand Router on channel 11 and a Microsoft Router on Channel 6. I have changed channels, turned off encription and tried Interference Robustness to no avail. I decided to connect to one of those Linksys Routers and no problems. So I am thinking that if I get a 802.11A Router I will not have any problem because the Frequency will be so much different then the others. PS I have not heard of anyone having any issues with the Airport Extreme Base Station and the MacBook Pro so I am inclined it is not a compatibility problem. Any thought on this issue would be appreciated.

I have both a Linksys WRT54g Wireless Router and a NetGear WGU624 A.B.G Router (set up as AP) on the same network. My CoreDuo MacMini correctly displays the network selections (both 802.11a and 802.11g) and allows you to switch dynamically between the networks. Make sure you have SSIDs set up differently so you can distinguish which is A and G network. Also iStumbler96 is a UniversalBinary and correctly displays all the channel information correctly.
The NetGear supports the Atheros 108Mbps link speed but Apple will only connect at a max of 54 Mbps while PCs with Atheros hardware connect at 108Mbps on both the A and B Network. No utility around yet that lets you unlock the capability to run at 108 Mbps on either the A or G network on the intel macs.
Hopes this clarify.
PS: Apple denies the capability this functionality is there but apparently uses Atheros driver code for OSX which make the process transparent. It is probably more trouble to remove the code than leave it alone. Throughput and range on the A network seems much better, probably because QoS (Quality of Service) is built into the link layer code. You can purchase a compatible NetGear PC card WG511U (A/B/G) tri-mode card and use both on PCs and MACs (PBG4 at present). The only driver available now for 802.11a for MacOSX is from Orangeware ( www.orangeware.com ) and install on a G4 Powerbook, then select A,B, or G networks. Orangeware is working on drivers for the MacBookPro. but you would need a PCI Express card. I don't have a MBP, but I understand that it also uses the Atheros AR5424 miniPCI card just like the intel MacMini, so an external A/B/G card is not necessary.
Net of this story is that, Yes!!!, the intel macs have 802.11 a/b/g support built it and functioning.
Jack
MacMini Mac OS X (10.3.8)

Access Point support 802.11a/g/b/r

can you suggest me the access point which support 802.11a/g/b/r ?
My problem is with 802.11 r. i am not getting clear idea about the wireless access point which will support 802.11r
kindly suggest me the product

There are no APs that support 802.11r yet. 802.11r is a standards extension to support fast secure roaming that was only ratified a month or so ago. It requires client device support and there are no clients that support it yet.
If you want fast secure roaming, Cisco offers CCKM on all our APs and CCKM and PKC on all our controllers.
I suspect though, that you may have meant, 802.11n, which is a higher data rate PHY/MAC standards extension. That is supported in the AP1250 series.

802.11a outdoor antenna

Hello,
I have to cover an outdoor area with wireless (802.11b/g). Due to the lack of wired infrastructure I thought of building a backbone using 802.11a.
In my area (ETSI) there are only specific 802.11a frequencies allowed for outdoor use (5470-5725).
How do I configure an AP1242AG to use only this frequencies?
What would be the best antenna to build the 802.11a backbone (there is nothing suitable in the cisco portfolio)
regards
HMK

Diversity is generally only needed in situations where you encounted multi-path interference, so if you have lots of metal in the area (for example) then it might be worth a go. If you go with diversity, I THINK you're supposed to keep the antennae about a wavelength apart, so ~12.5cm.
For the 5GHz links, try to keep the TX and RX antennae the same gain, although it's likely you'll need an omni-directional for your Root Bridge, and directional antennae for your None-Root Bridges. If you have different gains at the root / none-root, you can encounter problems with transmit power mis-matches - one AP can hear the other, but not vice versa.
The 1400 comes with a built-in directional antennae, or with connectors for adding external antennae. Most importantly though, it is rated for outdoor use, where as the 1240 is an indoor AP, which will therefore need cables running between the AP & Antenna.
2.4GHz antennae is entierly dependant upon AP positioning, coverage requirements, etc. 2506 is probably a good place to start if you're not very experienced with spec'ing antennae.
Regards,
Richard.

Does airport extreme 802.11a/c work with airport express 802.11n

does airport extreme 802.11a/c work with airport express 802.11n

"You can use the AirPort Express to extend the signal provided by the new AirPort, but the Express will not extend "ac" wireless since it does not have that capability. The Express will extend an "n" wireless signal if that helps."
This is what I am trying to understand.
So AXTRM w/ sep SSID for 2.4 (b/g/n) - call it SSID1 - and 5GHz (ac) call it SSID2 - WiFi Explorer confirms AC mode on 5G.
Using an AXPRESS to extend - I have the option of SSID1 b/g/n *and* the 5GHz ac SSID2 in the pulldown (it sees both?) --> if I select SSID1, it also extends this same SSID in 5GHz (both showing b/g/n) >> so I now have 3 signals on SSID1 (XTRM 2.4G, XPRS 2.4G and XPRS 5G) b/g/n and one signal on SSID2 (XTRM 5G AC) ac
If I select the 5Ghz ac SSID2 to extend - it prompts me "do you also want to extend (the 2.4GHz SSID1)?" --> select yes and I now have 2 signals for SSID (XTRM 2.4G & XPRS 2.4G) b/g/n and 2 signals on SSID2 (XTRM 5G 802.11ac & XPRS 5G 802.11 a//n)
Is the 5G SSID2 actually being extended from the Airport Extreme to the Express?
The reason I bring this up is I am having a lot of issues since iOS8 came out (especially on iPhone 6). Everything I am reading is pointing to when people have 2 AP's set to use the same SSID. When you walk to a part of the house where 5G 802.11 ac signal marginalizes, the phone does not immediately hand over to the 5G 802.11 a/n Airport Express.
My thought was separate the SSID's but to me, if the Express can't extend 5Ghz from the Extreme, it's taking a step backwards. I am better off getting a more powerful router like an ASUS and going with one AP, drop the WiFi roaming altogether
Any thoughts?

17" mbp no longer sees a 802.11a Linksys router...

I have one of the early 17" MBP. It used to work with a old 802.11a (Linksys) router. Lately it doesn't see the router at all. I've reset the router and another Windows machine can see it fine. I didn't do anything funny other than apply patches and firmware upgrades. Any help is appreciated.
Thanks
Macbook Pro 17" Mac OS X (10.4.7)

Maybe its helpful you to know that the 802.11a standard wasn't totally supported by Apple at the begining (read http://www.appleinsider.com/article.php?id=1465) so probably those patches did change something.
Have you tried different frequencies on the router?
Chris

Cisco Systems vs "CSIRO" 802.11a and 802.11g infringed upon the '069 patent

Hi,
any news about Cisco Systems and the "CSIRO" 802.11a and 802.11g infringed upon the '069 patent ?
http://www.buffalotech.com/products/wireless/
Dear Customer
As you may be aware, Commonwealth Scientific and Industrial Research Organisation ("CSIRO") sued Buffalo, Inc. and Buffalo Technology (USA), Inc. ("Buffalo"), for alleged infringement of United States Patent No. 5,487,069 ("the '069 patent"). Subsequently, CSIRO also asserted its patent against the entire wireless LAN industry, including, Microsoft, Intel, Accton, SMC and Netgear.
In it's lawsuit against Buffalo, CSIRO claimed certain Buffalo wireless networking products compliant with IEEE standards 802.11a and 802.11g infringed upon the '069 patent. Buffalo believed at that time and continues to believe that there are no grounds for CSIRO's allegations of infringement. The United States district court, however, found Buffalo to infringe the '069 patent and enjoined the importation and sale of Buffalo's IEEE 802.11a and 802.11g compliant products.
CSIRO's lawsuits are against the entire wireless LAN industry and could affect the supply of wireless LAN products by any manufacturer, not just Buffalo. The entire industry is resisting CSIRO's attempts to enjoin the sale of wireless LAN products. Recently, Microsoft, 3COM Corporation, SMC Networks, Accton Technology Corporation, Intel, Atheros Communications, Belkin International, Dell, Hewlett-Packard, Nortel Networks, Nvidia Corporation, Oracle Corporation, SAP AG, Yahoo, Nokia, and the Consumer Electronics Association filed briefs in support of Buffalo's position that injunctive relief is inappropriate in this case.
During the period of time that the injunction is in effect (10/1/2007), Buffalo cannot offer for sale, sell, import, or use its IEEE 802.11a and 802.11g compliant products in the United States. A list of the products covered by the injunction is attached here . The injunction does not prohibit sales of pre-existing inventories of products by Buffalo's customers. In addition, Buffalo has secured CSIRO's agreement to permit the replacement of defective products under warranty. None of Buffalo's other products are currently affected by this injunction.
While Buffalo believes that it will be successful in reversing the district court's decision and will obtain a stay of the injunction pending a decision on the merits, the Court of Appeals has not yet issued a decision. Should the Court of Appeals issue a decision staying the injunction, you will be promptly notified. After the stay is issued or a favorable decision on the merits is obtained, Buffalo will be able to resume the supply of IEEE 802.11a and 802.11g products
Please rest assured that Buffalo continues to stand behind their products and will continue to support all of our loyal customers as it relates to product warranties, technical support and the like without interruption.

I suspect after reading the patent and the litigation that you mentioned above, that the US District Court decision will be reversed as the patent appears to be very vague in its contsruction and verbage. Furthermore, the intent to hold the IEEE hostage on the ratification of 802.11n will not bode well in the court's eyes. If in fact the case is reversed, I believe that the members of CSIRO will be in danger of lost profits litigation from Buffalo. Stay tuned to this bat channel.

Unstable Wireless Bridge Connection via 802.11a(Radio 1) of Aironet 1242

Hi,
I'm going to setup up an AP 1242 in a remote area to support b/g client via a 802.11a bridge link (all using AP 1242).
Before the deployment, I tested the configuration in a lab environment. However, I found the bridge link will come up a while and suddenly gone. Resetting the root AP or the non-root AP cannot bring the connection up again. Sometimes, when I shutdown the b/g radio (radio 0) of the remote AP, the bridge link will be established again. Following is the log from the root AP.
Thanks!
*Apr 4 12:24:05.013: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to r
eset
*Apr 4 12:24:05.054: %LINK-3-UPDOWN: Interface Dot11Radio1, changed state to up
*Apr 4 12:24:05.665: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0, changed state to down
*Apr 4 12:24:06.009: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio
1, changed state to up
*Apr 4 12:24:06.013: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio
0, changed state to down
*Apr 4 12:24:07.054: %LINK-3-UPDOWN: Interface BVI1, changed state to down
*Apr 4 12:24:16.091: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associa
te: No Response
*Apr 4 12:24:16.811: %LINK-3-UPDOWN: Interface BVI1, changed state to up
*Apr 4 12:24:17.811: %LINEPROTO-5-UPDOWN: Line protocol on Interface BVI1, chan
ged state to upInternal error: command failed                                                             <<<< Internal error: command failed ??????
                                                                                                                               <<<<don't know the meaning of this message
*Apr 4 12:27:22.206: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to r
eset
*Apr 4 12:27:22.233: %LINK-3-UPDOWN: Interface Dot11Radio1, changed state to up
*Apr 4 12:27:22.233: dot11_mgmt: bad cookie returned from driver for mac 003a.9         <<<<<003a.928.dad0 is radio 1 / non root bridge of remote AP
928.dad0(expected 0x00000000, got 0x010ADAB0) - force driver to delete client             <<<<<don't know the meaning of this message
*Apr 4 12:27:22.235: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to r
eset
*Apr 4 12:27:22.262: %LINK-3-UPDOWN: Interface Dot11Radio1, changed state to up
*Apr 4 12:27:23.513: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0, changed state to up
*Apr 4 12:27:26.993: %DOT11-6-ASSOC: Interface Dot11Radio1, Station T9_QC168_Ca
ntil 003a.9928.dad0 Reassociated KEY_MGMT[NONE]
*Apr 4 12:27:28.465: %DOT11-4-MAXRETRIES: Packet to client 003a.9928.dad0 reach
ed max retries, removing the client
*Apr 4 12:27:28.465: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating
Station 003a.9928.dad0 Reason: Previous authentication no longer valid
*Apr 4 12:27:28.467: %DOT11-4-MAXRETRIES: Packet to client 003a.9928.dad0 reach
ed max retries, removing the client
*Apr 4 12:27:31.673: %DOT11-6-ASSOC: Interface Dot11Radio1, Station T9_QC168_Ca
ntil 003a.9928.dad0 Reassociated KEY_MGMT[NONE]
*Apr 4 12:27:32.687: %DOT11-6-ADD: Interface Dot11Radio1, Station 003a.9926.e76
0 Associated to Parent 003a.9928.dad0
*Apr 4 12:28:46.178: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating
Station 003a.9928.dad0 Reason: Sending station has left the BSS
*Apr 4 12:28:46.179: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating
Station 003a.9926.e760
*Apr 4 12:28:46.181: %DOT11-6-ASSOC: Interface Dot11Radio1, Station T9_QC168_Ca
ntil 003a.9928.dad0 Reassociated KEY_MGMT[NONE]
*Apr 4 12:28:47.196: %DOT11-6-ADD: Interface Dot11Radio1, Station 003a.9926.e76
0 Associated to Parent 003a.9928.dad0
*Apr 4 12:29:15.132: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthern
et0, changed state to down
*Apr 4 12:29:32.442: %DOT11-4-MAXRETRIES: Packet to client 003a.9928.dad0 reach
ed max retries, removing the client
*Apr 4 12:29:32.442: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating
Station 003a.9928.dad0 Reason: Previous authentication no longer valid
*Apr 4 12:29:32.443: %DOT11-6-DISASSOC: Interface Dot11Radio1, Deauthenticating
Station 003a.9926.e760
*Apr 4 12:29:32.444: %DOT11-4-MAXRETRIES: Packet to client 003a.9928.dad0 reach
ed max retries, removing the client
*Apr 4 12:31:10.285: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associa
te: Rcvd response from 003a.9928.2660 channel 6 2560
*Apr 4 12:31:18.286: %DOT11-4-CANT_ASSOC: Interface Dot11Radio0, cannot associa
te: AssociatingInternal error: command failed
*Apr 4 12:31:27.021: dot11_mgmt: bad cookie returned from driver for mac 003a.9
928.2660(expected 0x00000000, got 0x010ADAB0) - force driver to delete client
*Apr 4 12:31:29.107: %DOT11-4-UPLINK_ESTABLISHED: Interface Dot11Radio0, Associ
ated To AP T9_SML_LT2_AP2 003a.9928.2660 [None]
*Apr 4 12:31:29.108: %LINK-3-UPDOWN: Interface Dot11Radio0, changed state to up
*Apr 4 12:31:30.108: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio
0, changed state to up

Thanks dmantill for reminding me to revisit the antenna and related stuff.
As the setup is in a lab environment, the APs are put on a work bench next to each other, therefore, the radio output power was lowered.
After adjusting the output powers, it works as expected.
Thanks Surendra and dmantill.

IPad's Roaming Between Access Points

A company with 460 Cisco Access Points is using iPad Mini's to control lighting and other things, the iPad Mini's are roaming between access points VERY SLOW, they are dropping 45-50 packets between roams. iPad 2's and iPhone's are roaming just fine, if they drop any packets it's a max of 5.
Is there any differance in the NIC's that are in iPad 2's and iPad Mini's? Or is there a setting for fast roaming?

Hi,
It seems that these APs are not aware of each other, I would suggest you look into a controller based solution, that means you need some sort of controller base AP system to get this seamless roaming feature, I also suggest you check whether there's compatibility
issue for the device with product vender.
Yolanda Zhu
TechNet Community Support

Does the 27" iMac wireless card support 802.11a and n

does the iMac support the 5 GHz wifi format? How about the N spec?

I'm sorry but I don't understand this:
the unit supports 802.11a channels but it doesn't pick up anything.
Are you saying the iMac cannot connect wirelessly? And why would you be concerned that the very old 'a' standard may not be picked up? The latest standard is 802.11n, not a.
http://en.wikipedia.org/wiki/IEEE_802.11
So, is the iMac working wirelessly or not?

Connecting to 802.11a AP using WPA security - no go

I have an AP that is set to 802.11a (5GHz) using WPA security and is set to hide its SSID. My iMac is connecting to this AP without any problems whatever frequency i set on AP, hide/show SSID. The problem is - Macbook does not show this AP in AP list when requested, if i select other and enter correct settings (ssid and WPA passkey) it says - connection timed out, AP does not show any signs that something even tried to connect to AP.
the only resort is to use 802.11g when i can connect to AP without any problems.
in Network utilities it shoes that it supports 802.11a/b/g/n
hope i gave enough details.
later today i will try to set WPA2 instead of WPA, also will try to set no security settings at all.
any thoughts how to force it to connect to 5GHz AP?
edit:
forgot to say why i want to switch to 5GHz - the problem is - lately many 2.4GHz b/g APs popped up in neighborhood and started to cause latency/interference as some manage to follow me over frequencies i set up.
Message was edited by: janiskr

ok, setting to WPA2 solved the issue, because still, with WPA configuration i was not able to connect. allowing TKIP and WPA2 allowed macbook to connect. Also iMac changed the settings to WPA2 and it didn't matter that it had correct settings fot WPA.
weird.
maybe someone could point out how to set these things explicitly, so i can choose what settings are in use.

Roaming between 802.11a & g

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