High throughput on access points

Hi,
AP's today support 802.11n ( upto 300Mbps ) throughput. Is there any specific configuration to enable 802.11n to be used as backend link for the 802.11a usual links.
or does the ap auto negotiates. What factors determine if the AP will use 802.11n as its backhaul link?
Thanks in advance!

"Factors that determine which data rate is , the power of the device's Wi-Fi radio transmitter/receiver"
This means that client devices can come with various TX power. If you look at the data sheet for client wireless cards, you might see various different output power. For example, 100mW, 50mW and or 25mW. There are even some in the 200-300mW.
When you implement a wireless infrastructure, you want to match the power of the lowest client you have. Many access points can be configured to the max for the country your in (allowed by regulation). So if your access point can achieve 100mW but you have clients that are 50mW, then you may want to lower the power of the access point to 50mW.
Power or TX power on the access point will affect the coverage area, as the higher the power, the more the coverage. If you over power the clients, then the clients can hear the AP, but the AP might not hear the client. That's why its important to adjust the power on the AP to your lowest client.
Thanks,
Scott
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Response times (PING) very high with CAP3602i access point

I have installed an access point CAP3602i in mode HREAP a controller Model 5508 with version 7.4.100.0 but the response times of the connected users are very high.
The less users are connected to the access point is faster surfing the internet and response times are low. But if there are many users connected, increase response times.
I'll be grateful someone comments any experience with this problem.
Thanks

We are talking about 15 users per AP, but that everything is surfing the internet and not so heavy downloads before aps 1141 and had had no such problem response times were normal between 2,3,4 ms
There is performing some function more cap3602i ap causes high response times.
Supposedly CAP3602i I say are better than the 1141, which is why we made the change but we found with surprise that high times.
The SSID was HREAP doubt it has anything to do with the 1141 does not give the issue of high times.

High Transmit discards on 1131AG Access points.

I am running a number of AP1131AG access points that are showing transmit discards in the millions each day on the dot11G radio.
all of these AP's are configured to use WPA/PSK and TKIP. All are running IOS 12.3(8)JEA.
I'm puzzled by this as I also have a number of older 1231G access points that do not have the same problem.
Can anyone tell me what might be causing such a high number of discarded packets my 1131's

Use the command on the AP "sh dot11 associations" will give you clients which have successfully associated. If you add the client MAC address at the end of the command you'll get a detailed information. Look under "Signal Strength" and "Signal to Noise". Under Signal Strength you want a value of -75 dBm or lower (lower values the better). -76 dBm and up is bad. Under Signal to Noise, you want a value of 25 dBm or higher (higher values the better).
For measuring signal strength I use Airmagnet but you can use Netstumbler or Cisco Wireless Site Survey.

Testing wireless access points

I have been deploying Cisco (as well as Aruba and HP) wireless in the enterprise/education for some time. One of the selling points of the Cisco model IMHO is the ability to do agressive load balancing. I have been asked to test a smaller venders enterprise wireless solution. I have sat in a few calls/presentations with engineers from this vendor and they do not have any answer to how they do load balancing (other than it just works). What are your opinions on the importance of load balancing especially in dense environments (education). Do you recommend any applications or ideas to test how the AP's will work in a dense environement (I will be doing some stress/throughput testing but I'm thinking of how I could emulate 25+ clients hitting one AP)? Do any of you wifi-heads have any opinion or experience with enterprise wireless solutions from any of the smaller vendors?
Any help or advice is greatly appreciated and will be rated.
Thanks.

Here is my take on it. I have been deploying high density wireless in education for a while. Client load balancing send out a status code 17. The issue is that devices that do not support status code 17 fails to associate to the access point. My first experience with that issue was with Apple devices, then some Dell laptops and HP laptops. So in my opinion, I don't enable that feature due to the impact it has. Does it make a big difference... from my experience in education not really. In a dense environment you will have devices join other AP's around the area, but you might see more client associations on a given AP. If you design for high density I think you would be fine. I don't have any experience with other vendor wireless as much as I do with Cisco so I really can't compare.
We use Veriwave to test high dense user.
http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809c2fc3.shtml
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Apple TV 2G (Airplay and Homesharing) can only stream from devices on the same wireless access point range??

connection:
40 Mbps Fiber Broadband connection using:
Devices:
1. Main Modem/router (AP1): Huawei HG8245 (provided by ISP) - Wireless enabled.
2. Remote Access point (AP2): Linksys/Cisco E3200 Wireless gigabyte router flashed with DD-WRT v24-sp2 (06/14/11) mini (Cascaded -wired- LAN to LAN from main modem).
3. Wireless Repeater to cover a dead spot (AP3): Linksys/Cisco E1000 wireless repeater.
4. Apple Tv (AT2G) with home sharing/airplay enabled.
5.( Ipad) with home sharing on itunes enabled.
6. Win7 (PC) using iTunes with Home sharing enabled.
all devices are updated to their latest firmware.
In order to cover a large 3 story house with Wifi. I had (AP1) is located on the first floor, while (AP2) is located in the basement floor directly wired by LAN to LAN with (AP1). (AP3) is located on the Ground floor away from the living room to repeat wireless network into the back yard. While (AT2G) is located in the living room on the ground floor right in the middle of both (AP1) + (AP2) while connected via Wifi.
Network SSID, security, passphrase and wireless settings of (AP2) are identical to (AP1) to create a single big LAN/WLAN roaming network where all devices connected to both wireless access points can find/share the others. As understood, it's refered to as bridging.
I have noticed that my iphone/ipad does not show the airplay button anywhere within the wireless network. it seems that the apple TV randomly choses to connect to the AP with stronger signal, or switch to the other in case of a reboot to one of them.
to elaborate further, if i was sitting in the living room (groundfloor), trying to airplay some you tube contents via Wifi to my Apple TV, i may not find the airplay button available all the time, i found out the reason is while i'm wirelessly connected to AP1, the Apple TV was connected to AP2 and both deviced cannot detect each others to enable my purpose. that goes the same for Home Sharing. only if my Ipad/PC and Apple Tv are on the same wireless AP. they would detect each others immediately.
although, the second AP (AP2) is suppose to extend my wireless network of the same subnet in which any device connected can be found.
After all sorts of trial and error tweaking my router/access point, I thought the problem would be due to the Linksys 3200 capability of bridging WLAN and lacks few protocols that enables my purpose. i have flashed the firmware to a DD-WRT, but again, problem was not solved.
I have not tried having my Apple Tv wired to either router/AP, but i assume it may work well if i do so. i still need to solve this wireless connection issue though.
Am i the only one with this problem, would there be something wrong with my setup?
Your feedback is highly appreciated.

You may or may not already have your network set up correctly, it's just that I can't tell from what you have said.
I have a main router provided by my ISP, I have several other Airport Extremes and Airport expresses connected by Ethernet, all set up to bridge the network created by the main router.
Each maker has their own settings, but bridging should be reasonably obvious. In simple terms my main router distributes IP addresses to all devices, the Airports bridge that network by passing these addresses to the devices from the main router. A base station that isn't in bridging mode will distribute its own addresses to the devices connected to it.
I don't really follow your next point.
instruction for configuration vary from manufacturer to manufacturer, the best course of action here is to refer to the manual. If everything is set up properly the addresses of everything on your network will have identical sets of numbers for the first 3 of 4 groups of numbers that make up an address, the last set must always be different. I think the part you are referring to with your DD-WRT is the option to have Ethernet and wifi bridged or not.
Some routers may be easier to configure than others, but generally speaking they should all work with the Apple TV. 5Ghz is less likely to suffer interference but it is much more likely to be blocked by solid objects, it may or may not be an advantage.

How to add a second router as access point and wifi signal extender

Previously I had 2 linksys routers and was able to configure them as one in separate areas of my house. I think it is called cascading. The 2nd router acted as an ethernet switch with 4 extra ports and it provided a wifi signal to areas of my house that previously had a weak signal when I used only one router.
I have since switched to an Airport Extreme as my main router. I can't seem to get the same configuration with the linksys router, it is Model E1000 and has an "N" signal. The Linksys E1000 I think is the newer model of the old WRT54G Linksys. I can't get it configured to work. I have searched high and low on the internet and can't find anything simple enough for a novice to understand. I did read something that I may have to assign a "DHCP Reservation" on the Apple Extreme. I couldn't figure that out.
Can somebody please offer some guidance on how to get this to work?
Thanks

You have two routers producing two networks with the same name, so they will show up as two networks on any type of scan by a wireless utility. This is normal.
If you had used two Linksys devices, they would probably show up as one network, not two. Linksys has a feature that allows this to occur, but this is not true of Apple devices.
As long as the wireless network name, wireless security and password match up between the two routers, the two networks will behave as if they were one. As computers change location, they will automatically connect to the wireless access point with the strongest signal.

Access points wont accept clients on 2.4 GhZ

Hi
We are having some Issue with some Access Points are dropping clients on 2.4 GhZ radio, the radio is if you SSH to the Access Point "Dot11Radio0 is up, line protocol is up".
Our setup is 2 x Wism2 controller (7.5), a CPI (1.4), and around 750 Access points of various types (1121, 1131, 1142, 2602).
If we reset the Access Point from CPI it comes up and it will again accept clients on 2.4 GhZ for a random time period, sometimes it works for some hours, sometimes for a couple of days, total random.
The once we have seen the problem on is as I know 1142:
Software Version
7.5.102.0
Boot Version
12.4.23.0
AP Model
AIR-LAP1142N-E-K9
IOS Version
15.2(4)JA1$
Hope to get help finding a solution.
Best regards
Jørgen

If you have a high density deployment, you might want to look at your RRM. What is the power set to on the AP's. If the power is set too low, that can cause clients not to see or be able to join an access point. If this is the case, you need to set the min tx power level for the 2.4ghz radio which is under the wireless tab in the 802.11bgn TPC.
If you have an issue with a certain AP model, it might be a bug, but you didn't mention what model AP is was happening to.
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IOS7 on iPhone 4s: Since I have iOS7, my 4s connects very slow (or not at all) to a known Wi-Fi access point (e.g. at home). This this a bug?

Since I have installed iOS7 on my iPhone 4s - 16G, my 4s connects very slowly to my home Wi-Fi network. Sometimes it even doesn't connects at all. Which result in a higher mobile data usage (and thus higher bill at the end of the month).
Can this error be solved in iOS 7.0.4?

Hi masterwil,
The article below may be able to help you troubleshoot your Wi-Fi issue.
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398?viewlocale=en_US
Reset network settings by tapping Settings > General > Reset > Reset Network Settings.
Note: This will reset all network settings including previously connected Wi-Fi networks and passwords
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT4199
I hope this information helps ....
Have a great day!
- Judy

Is there any way I can control which specific access point I connect (and stay connected) to from amongst a set of access points with the same SSID?

I'm working from a boat in a harbor in which the ISP has deployed numerous access points around the periphery. All the access points share the same SSID and each is configured to use either channel 1, 6 or 11. From my location, there are over a dozen of these access points "visible" (based on the the output of WiFi Scanner) with a range of RSSI and S/N values that vary over time.
The ISP has told me that the quality of my connection should be "perfectly fine" for any access point with an RSSI value better than -75, but I know from experience that my connection quality is miserable (i.e. < 50Kbps download) for almost all of these, including those with RSSI values better than -75. There is at least one exception, however, which gives me on the order of 2Mbps download, which is "great" in this context.
I've tried using a more powerful USB antenna plugged into my MacBook Air (mid 2011), but as far as I can tell, it really doesn't make much difference. Neither does my location within the boat. The overriding factor seems to be which access point I happen to connect up to.
I should point out that the closest access points are about 75 yards away, with many of them being several hundred yards away or more. I'm guessing that even though the signal strength of some of the distant access points is causing them to get "chosen" some times, the results are unacceptable due to the distance.
I'm hoping that I can determine, through experimentation, which access point(s) provide(s) acceptable performance and then configure my Mac to limit my connection to those points through whatever mechanism I need to use (e.g. channel, MAC id, etc.).

Establishing a wireless connection with a client computer is left to the access point for various reasons. One reason that your Mac may not connect to the strongest access point is that it may have reached a limit of the number of clients it can serve, leaving it unable to accept a connection with another. The limit may not be very large.
Suppose that happens, and your Mac establishes a connection with a more distant access point having a weaker signal. Then, suppose a client drops off the network. Doesn't this mean your Mac will switch to the stronger access point? Not necessarily. The throughput delivered to and from your Mac would have to drop below a threshold specified in the AP for it to drop the client, leaving your Mac free to connect with another one. The reason for this is to prevent rapid switching from one AP to another in an area in which two signals are of approximately equal quality. If that were to occur the frequent and repetitive handshaking between the two devices would slow throughput to zero.
In an environment in which several access points are broadcasting the same SSID, Apple provides no insight as to how it determines which access point to choose. This is the reason I suspect this "choice" is a function of the router, or access point. The connection originates with it, not the Mac.
Now, what would solve your dilemma would be to determine a way to control the access point with which your Mac connects, by specifying the access point's unique MAC address for example. In this happy circumstance, you could maintain an editable "whitelist" or "blacklist" of the harbor's access points and be able to choose which among them you prefer.
I do not believe OS X maintains such a record of MAC addresses though, only those of the routers it uses. If I am correct about that, such a solution is unlikely to exist. Don't let that discourage you from searching for one though... I would concentrate on something like "selecting access point by specific MAC address".
I did find this patent application though:
Roaming Network Stations Using A Mac Address Identifier To Select New Access Point
Perhaps it's a start

Use of non-Apple Access Point

Currenlty I have an Airport Extreme in the back bedroom of a ranch style home connected to my Cable Modem Router. I have two sets of speakers in the other end of the home with Airport Express units plugged into them so as to play music. The Airport Extreme creates the wireless network with the Express's joining the network.
I have recently added a Gigabit Switch to the mix that works just fine plugged into the Extreme's LAN port so as to have cabled connected to AppleTV, Mac Mini...etc in another room of the house.
My signal on the opposite end of the house as the Extreme has always been week so I purchased a High Power (2,000 milliWatts) 11g Access Point. My question pertains to the Access Point. I will be plugging this into the switch and placing into the part of the home with the weak signal. In my set up do I just need to match the SSID (network name), wireless security level and password as the APX? Also, the vendor told me to choose a channel on the opposite end as my existing network... does this make sense?
Thanks for any comments by those that might have a similar set up or knowledge on the issue.

I've tried several things now to improvie my signal coming from the Access Point, which is made by EnGenius, to include changing the names to match and to change channels. Nothing seems to effect the signal strength of the Access Point.
Below is a screen shot of iStumbler. Klein2 is the Access Point with Klein at 58% being my AirPort Extreme. The Access Point is two rooms closer to me and shows less of a signal than the AirPort Extreme. The first item in the list is an Express unit plugged into the back of a speaker set up to participate in a network and is not plugged into an ethernet cable.

N+1 & OfficeExtend Access Points

There seems to be a lot of conflicting information out there so I thought I'd ask you guys.
Is N+1 supported with OfficeExtend Access Point (OEAP) 600 clients supported?
I want to implement it on the following
2* 8510 WLC's
release 7.5

On any AP that joins the WLC including the OEAP 600, you can specify the access points high availability. That is the definition of N+1, specifying the primary, secondary and or tertiary wlc's.
I also just verified this on our lab network with OEAP 600's.
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Document on 1131 Access point

Please provide the documentation to configure 1131 Access Point.
We are getting documentation for 1130 and not for 1131.
Help wouldl be highly apprecited.

Hi Navinder,
It's the same. 1130 is the generic model number while 1131/1132 is a specific model number.

Aironet access-point 1231G reboots itself frequently...

Hi there,
We have one 1231G access-point which reboots itself after every certain time, its uptime has never crossed some 30 - 35 mins, usually it remains to 10 -15 mins. Some days ago, I saw a similar problem being discussed on thsi plateform but after the NetPro being changed, I could not find the progress on that thread. The guys in that thread suggested to physically separate the wireless controllers and then re-attach it back. Instead of doing this I tried physical reboot/power-cycle of thsi access-point. That access-point behaved normally for some days but after some that it aain posed the same problem. Kindly help me with probable solutions to it.
Thanks and regards,
Gaurav

Hi Scott,
The show stack command shows like:
Minimum process stacks:
Free/Size   Name
4572/5500   soap_flash init
3084/5500   Soap Flash Save Variables
5116/5500   Clock Update Proc
5240/5500   dot11 platform init
10364/11000 Soap Upgrade fetch Config File
8696/12000 Init
5084/5500   RADIUS INITCONFIG
32276/33000 TCP Command
Interrupt level stacks:
Level    Called Unused/Size Name
4         594   8296/9000 dot11 radio interrupt
6         253   8960/9000 NS16550 VECTOR
This looks good to me, although let me know your thoughts on it.
One thing I have observed that the it showed a high CPU spike when it reboots and stops responding on the network. sho proc cpu his command, just after the reboot shows a spike of between 85 to 100% CPU utilisation. Any thoughts!
Gaurav

WRT160N as Access point

Hey all, The library 2 buildings away (my house, neighbors house, library) has free public wifi. They have a 3com N wireless router. I can only get a signal if I build a cantenna. Now, I am looking to take that signal and enhance it so all wireless componets inside my house can pick up the wireless signal. The way im looking to do this, from my understanding of reading and reading non stop through discussion boards and other internet articles, is to purchase a WRT160N wireless router, download the DD-WRT firmware to turn it into a access point. Now, my problem is that I will not have administative control as the router is at the library and I highly doubt they will let me get into their admin settings. Is there any way this can be done. I am looking to place the 160N halfway between my house and the library. Any information will be greatly appreciated. Thanks

You can use the WRT160N as an access point if you are trying to upgrade the router with dd-wrt firmware as the dd-wrt firmware has the feature to make the router work as an access point.However,while configuring the WRT,you need to match all the wireless setting to WRT like SSID,Security Type & Key,Wireless Channel including the Wireless Mac Address for the router.
**Upgrading the router with third-party firmware will void the warranty period.

E4200 as access point ?

Hi everyone, trying to figure out something with my setup, cant seem to be able to access my e4200 once its bridged, here is my setup, DSL modem to a dlink 655 at far end of house where most action happens, had a dlink 615 which pooched an replaced with e4200 for other side of house mainly for bedroom wifi, an 1 wired comp (sons desktop), was using the dlink 615 as an access point, so wanting to replace that I grabbed a e4200, setup all wifi stuff an most others settings an set it into bridge mode, moved line over from wan to lan port an works pretty good, only issues I have is that I cannot access the e4200 web interface anymore, have to reset an start from scratch if I wanna change some settings, an second issue is wifi speeds seem low in terms of Mbps, right next to e4200 I can only get 65-90mbps on laptop, next to dlink 655 I get 270mbps, any help or suugestions would be great, thanx !

The E4200 is playing nicely with the available bandwidth. Due to that it picks bandwidth 20 Mhz or 40 MHz automatically. If it finds too much interference it will revert back to 20 MHz and thus max speed you see on the 2.4 GHz band is usually 150 Mbps or sometimes 75 Mbps depending on the amount of interference.
Try to make transfers of a large file from a wired computer to wireless. Compare the transfer rates on both access points. Often you find that a foreced 40 MHz connection (which you cannot do on the Linksys) gives you crappy throughput on the 2.4 GHz because you allocate 2/3 of the total band available and thus almost any other wireless transmission in your neighborhood would interfere and slow down the transfers...

High throughput on access points

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