Clients seem to drop their connectivity intermittently

Hi,
We've been having an intermittent issue where clients seem to drop their connectivity intermittently. We have an SSID configured with 802.1x and user-machine authentication using MS-PEAP. ISE is currently used as the radius server,
Synopsis:
When the client drops out, it is associated to the AP at good signal strength -64dBm. All our clients are running Win7. Once the issue occurs a yellow exclamation mark appear across the system tray wireless icon and a message appears in the "Network and Sharing Center" that either says “no internet connection” AP status on the controller is associated The client can ping its default gateway, but no connectivity above layer 3 appear to be working. This behavior is extremely intermittent. The only way to restore full connectivity to the client is to hard reset the wireless adapter or switch to another SSID and go back to the problematic SSID.
Today , I've worked with the same Cisco TAC engineer for almost three hours trying to diagnose and analyze this issue. We've tried to diagnose several clients that were having this issue by running debugs on the controllers. The wireless controllers were showing the clients were still associated, yet the clients couldn't communicate with network. I ran a link-test from the controller to the affected clients and all came back with failed status.
Any idea

a link test could fail depending on the adapter and CCX. If the client can ping it's default gateway, then the issue is probably, more than likely, not the wireless. Pinging the GW proves the client is passing traffic out of the WLC and upstream. If they are not able to reach any resources you might want to look and check your CAM and arp table entries, it is entirely possible that a MAC is being spoofed, or an IP address is being stolen somewhere.
HTH,
Steve

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Actiontec MI424WR dropping wireless connection intermittently; wired connection works

I've had this router for about two years, with no issues.
Beginning on Saturday, our two laptops and phones began losing their connection to our wireless network, dropping the signal every 30 seconds or so. I tested the wired connection by plugging the laptops directly into the router, and both computers functioned properly - no issues connecting or staying connected. I have my Roku hard-wired to the router, and that also has had no issue, so it'd definitely a problem with the wireless signal to my devices.
Spoke to a CS rep, who had me first check the internet signal (green, blinking sporadically, which I was told indicated no issue with the connection), then had me reset the router and unplug. No dice. She said the internet signal seemed fine, and that "everything looked good on her end", whatever that means. They're sending a new router which I'll receive today or tomorrow, but I have trepidation.
Has anyone else had this issue? I saw alot of router issues on the forums, but wasn't sure if everyone was having this specific problem (just wireless connect issues).
Solved!
Go to Solution.

This turns out to be good advice. I changed the channel on my router settings to 11 (per an earlier post on a different thread), and I haven't had an issue since. Here's the original post: "01-21-2011 11:32 AM that type of problem doesn't sound like a router issue, but instead sounds like a wireless transmission issue. you may be able to resolve that fairly easily.. Try to change the wireless signal. you can do that in the router. open a browser, and go to http://192.168.1.1, user name is admin. and the password is most likely the serial number found on the service tag of your VZ router unless you changed it. Once you login successfully, go to the top and hit wireless, then on the left basic security. then go to option 3 which is channel 1, 6 and 11 and are the only channels you should try. So it will likely be set to auto, change it to 11 and put the check for keep settings even after reboot (Directly under the channel) and then hit apply., after you hit apply, test your connection out, if you notice a difference, leave it like that until the problem happens again, and if it happens again, go back into the router, and try channel 6, test it out. and then finally 1 if the first two don't work."

Intermittent Wireless Connection, Dropping Wireless Connection

I am asking this in hopes of finding at least some way to diagnose my problem and hopefully eventually solving it. My wireless connection currently drops at varying amounts of time. Sometimes I can go 20mins others merely 5mins. The Airport reads that I am still connected and have a strong connection but when I try to navigate to a page with the browser (either firefox or safari) it merely times out after trying to load the page for up to a few minutes. I have changed the channel and frequency of my router (first router I tried was a Trendnet TEW-432BRP) and I have no cordless phones or other possible wireless obstructions. (I do have a very very infrequently used microwave but being that it's on the other side of the house and I can be sitting next to the router I doubt this is the culprit)
Then I tried changing routers to a Belkin N1 Vision router. Same issues. Additionaly worth noting all other PC's and linux machines on my network (about 4-5 other computers) all work just fine with out dropping their connections (with both routers).
Then I brought my original machine (a white macbook less than a year old) into the apple store, thinking at this point it was a hardware problem with my machine. They the replaced the airport card twice and the logicboard once. Eventually decideing that they should just replace the whole machine. Now with my new unibody I thought I had finally illeviated the problem but now I am having the same issues with an intermittent connection again.
If I turn off the Airport card and turn it back on again usually it will reconnect and allow me to browse again. But not always. The odd part is that generally when using another program that accesses the net the connection does not seem to be interrupted (such as with bit torrent). Very odd.
Anyway I tried using my computer at a friends house with the same trendnet router (his router but same model) and still the connection issues persist. Any ideas on what I can do or try to at least even begin to understand why this is happening would be helpful. I want very much to get to the bottom of this. Thanks for your help.

You didn't get the Apple Store to replace a white MacBook with a unibody?!
Anyhow - the connection problems could easily relate to an incompatibility between OS X and the router in question. Or it could simply be a setting on the router that isn't working well. To assist in the diagnosis... can you please supply:
1) The security mode of the router? (WEP or WPA/WPA2 and AES or TKIP).
2) The network mode (G/N)?
3) The signal strength as reported by Airport (RSSI)
You can get most of this information (all except the security mode) by holding the option key down whilst clicking on the Airport icon in Finder. For the security setting you can go to your routers configuration screen (or you can get it from the command line).
Cheers,
Rodney

MacBook Air + Time Capsule frequently dropping internet connection

I too have been having frequently dropped wireless connections between my MacBook Air (MBA) and my Time Capsule(TC). My TC is connected to a cable modem and I also have an Airport Extreme Base Station (AEBS) at a different part of my house which is used to extend my network connecting via ethernet to a PC running VISTA, and wirelessly to a printer and an older MacBook. I also connect wirelessly to my home network with two iPhones, a Squeezebox 3 with a server running on the PC. I have an Apple TV and a Squeezebox 2 connected to my TC via ethernet.
When my connection drops I will either see a Time Capsule disconnect message or if I am surfing the web, the browser just hangs. The wireless ICON strength is still pegged a the max level. None of my other devices (wireless or ethernet) connected to the TC or the other AEBS seem to drop their internet connections. I can re-establish the connection on my MBA by either turning off my MBA's Airport wireless and then turning it back on or by running the network diagnostics. The latter method usually shows green lights for all but the "Internet" and the "Server" which will have yellow lights. Usually when I select my wireless network and press continue, it will prompt for my WPA2 password which I have to reenter even though I always check the box for it to remember the password in the keychain.
After reading the various discussions on disconnect problems and trying the various "solutions" I was still having the disconnect problem.
Last night, I decided to turn off my Time Capsule and was then able to maintain an internet connection for considerably longer than before. Perhaps it was one of the other "solutions" that caused that. After turning my TC back on, the disconnect problem reoccurred within about 5 minutes.
Next, I did my too frequent Time Capsule remedy which was to disconnect the power and then reconnect the power. (Seems like some of these devices (APPLE TV included) could use power switches.) I then deleted the .sparsebundle backup file on the Time Capsule. I was then able to restart Time Capsule backup and things have been running uninterrupted for over 12 hours...still backing up (20GB in 12 hours? Doesn't seem very fast!). I can report back later if this actually "fixes" my disconnect problems in the future. I am dubious that it will.
I have several questions about the MBA and the TC/Time Machine backup operation.
1.) I often forget about the TC when I close the lid on my MBA and haul it off to work. At work (connecting via ethernet), I will eventually get a TC disconnect error. But I am wondering if there are points in the backup process where a random disconnect will cause some sort of TC corruption. What is the recommended way of handling this? Should I always stop the Time Machine backup before turning off my MBA? (A nuisance if so!)
2.) What is happening when the TC backup operation stops functioning and hangs up the MBA's internet connection? (I see lots of messages logged in the system log when this happens; but, of course, I don't have much of a clue of which ones are normal and which are not normal. I could send a copy of the logs when it happens next (I am assuming it will).
Also one other anecdote. A few months back, I had taken another AEBS to my work to use during a training conference. My MBA kept dropping its connection while the other PC laptops in the room maintained their connections...(very embarrassing!). Maybe one of the other "solutions" would have fixed the problem or maybe if I had just turned off my Time Machine backup it would not have disconnected. I will repeat that exercise when I get a chance now that I have some things to try.
It seems pretty clear to me from my own experiences and the discussion reports of others that the disconnect problem lies in the MBA's wireless internet connection software or the configuration of it. It seems like it is having difficulty recovering from various wireless connection "mishaps".

Folks, I was having a very similar problem for the last 6 months. My connection was fine until June 2008, after which my Macbook and my Time Capsule would constantly conflict. If I rebooted or reset the TC, or the MB, things would be fine for a few minutes or sometimes a few hours and the problem would recur soon thereafter. About a month ago, I had to do a clean reinstall and the problem vanished for about 5 days, after which it reappeared. My MB never had a problem at work, or at someone else's home or with other routers, only with TC. Apple sent me a new TC, then they replaced my Airport card but the situation did not change ... UNTIL ABOUT AN HOUR AGO.
An hour ago, I called Apple for the nth time in the last 6 months, and the rep heard me out (just like the previous n-1 reps). He then asked me to to System Preferences --> Accounts --> Login Items and asked if Real Player Downloader showed up in my list. Indeed it did. He asked me to remove it, and told me that Apple had just figured out that the Real Player downloader was recently found to be causing a drop in the connection between Macbooks and the TC (as well Airport Express).
The problem I've been having baffled everyone. All the previous reps, the guys at the Genius Bars, nobody had a clue. Joe (the rep I spoke with this morning) seemed very confident that the removal of the Real Player Downloader from the list of login items would resolve the problem. So far, so good. My connection seems solid (its only been an hour, but earlier it would drop after 5 minutes of use).
I hope my problem that (literally!) used up hundreds of hours of my time has been finally resolved. I hope this solution will work for at least some of you as well. What gives me hope is that this solution is logically consistent with the history of my problems. I probably first downloaded Real Player in June 2008. And when I did a clean install, I remember downloading Real Player a few days after the reinstall. So I'm pretty hopeful that my issue has been finally resolved.
Shame on Real Player for putting out a defective piece of software. And thank you Joe!

Lenovo V560 drops wifi connection - cannot restore without reboot

Hello,
First off let me say that I'm earning a BS in Computer Science, so I know more than most when it comes to computers, yet this issue vexes me. I only say that so that any replies understand that my level of technical comprehension is far above average.
The title pretty much says it all, I have a 6month old Lenovo Ideapad V560 that cannot maintain an internet connection. Let me describe the problem in a little more detail:
PROBLEM:
This computer can connect to any wifi, and seems to drop the connection fairly randomly, however it will drop the connection FASTER when I'm more active, such as loading multiple web pages simultaneously. That said, it ALWAYS drops the connection during a session, and NOTHING I do can restore the connectivity apart from rebooting.
This issue has nothing to do with the router, as it happens on every wifi connection I've ever connected to, school, home, work, McDonalds, etc.
I've already extensively researched the issue, so please don't reply and just start linking me to related threads, I've read them, they weren't helpful.
I've done a few things already in an effort to resolve the issue, such as:
1) Re-installing Windows 7 Pro x64
2) Re-installing wifi driver
3) Disassembling the machine, removing and reinstalling the wifi Card
4) Disabling "Allow computer to turn device off" power management settings for wifi card and miniport (all network devices, actually)
5) Removing all Lenovo "bloatware"
Again, it is not a connection specific issue, it doens't matter how the connectio is configured, it seems indepedant of that.
Any help anyone can offer would be helpful!

On topic: I have the same issue with Lenovo B560 (factory installed WiFi adapter: GTC BCM4313 M).
In the same time and the same WiFi network my old Lenovo IdeaPad Y550 works perfectly.
Is there any way to make this Broadcom (or GTC?) adapter work uninterruptable?
Currently it requires to reboot or hibernate and power on again to revive adapter.
Off topic: yesterday instead of my message about the same issue posted I have seen the following error:
Please correct the highlighted errors and try again.
Post flooding detected (community got posts of a unique message more than 1 times within 3,600 seconds)
But the message has been tried to be posted once.

Ip inspect problem, dropping important connections on 887VAMG router

Hi All.
I've got a problem on 887VAMG router. It drops important connections. As customer wants to have a firewall I created ACL and ip inspect rules ,but the router drops their connections to cloud and some websites are not opening. So I removed ACL and most ip inspect rules just to test if it effects that. And left only ip inspect http urlfilter. But still they have those problems, so I'm really stuck how to configure that firewall.
I'll be highly appretiated for any help.
The below some dropping connection review:
%FW-6-DROP_PKT: Dropping tcp session due to RST inside current window with ip ident 13968 tcpflags 0x5014 seq.no 1629693318 ack 1687676045
000049: Mar 6 11:49:21.324: %FW-6-DROP_PKT: Dropping http session <ip>:1766 69.171.242.12:80 with ip ident 26247 tcpflags 0x5018 seq.no 264144210 ack 642133125
000050: Mar 6 11:50:00.774: %FW-6-DROP_PKT: Dropping http session <ip>:4708 69.171.242.12:80 with ip ident 2425 tcpflags 0x5018 seq.no 3819869211 ack 1862176018
000051: Mar 6 11:50:52.515: %FW-6-DROP_PKT: Dropping http session <ip>:2599 173.194.34.90:80 due to RST inside current window with ip ident 22909 tcpflags 0x5014 seq.no 899975979 ack 92642430
000052: Mar 6 11:51:24.013: %FW-6-DROP_PKT: Dropping http session <ip>:4765 194.106.151.77:80 due to RST inside current window with ip ident 4118 tcpflags 0x5014 seq.no 3161679649 ack 1450263460
068974: Mar 6 05:10:14.676: %FW-6-DROP_PKT: Dropping http session 66.101.6.51:80 <ip>:1530 due to RST inside current window with ip ident 8954 tcpflags 0x5014 seq.no 2056370527 ack 2999433041
068975: Mar 6 05:35:48.385: %FW-6-DROP_PKT: Dropping http session 66.101.6.51:80 <ip>:1882 due to Stray Segment with ip ident 27148 tcpflags 0x5010 seq.no 939083425 ack 724203821
068976: Mar 6 05:36:21.734: %FW-6-DROP_PKT: Dropping http session 66.101.6.51:80 <ip>:4919 due to Stray Segment with ip ident 2945 tcpflags 0x5010 seq.no 704890853 ack 370246242
068977: Mar 6 06:29:14.628: %FW-6-DROP_PKT: Dropping http session <ip>:1214 66.101.6.51:80 due to Invalid Segment with ip ident 26797 tcpflags 0x7002 seq.no 2896034509 ack 0
068978: Mar 6 06:32:51.923: %FW-6-DROP_PKT: Dropping http session 66.101.6.51:80 <ip>:1653 due to SYN inside current window
Dropping http session due to RST inside current window with ip.
Dropping http session due to Stray Segment with ip.
These 2 are most of all. Why do they drop sessions? What do they mean?
Thanks.

I removed a firewall, ip inspecting and ACLs, but there is some delays for web browsing and slow internet connection.This model of router C887VAMG was introduced just in January, so I'm wonder if there are some bugs in firmware.
Why is this router is not capable to do inspection and firewalling? It shouldn't really drop the performance so high.

Why are the Mac Pro's dropping their server connection over a PC network.

This seems to be a common thread on the discussion, but I can't find a resolution. I have a mix of G5s and Mac Pro's all running 10.4.10. All the machines are set to manual 100BaseT Duplex. The Mac Pro's constantly drop their network connections or show write errors when you are trying to save. Can someone point me in the direction of the answer? thanks.

Might be some of the same issues in this thread assuming your MBA is a 2013 model
New Macbook Air - wifi connectivity

Difficulty using a projector. I have a MBP 17" and am running 10.6.8. Often I need to make a Powerpoint or other presentation at a client and I want to connect my computer to their projector. Either it won't display on the projector at all. HELP!

Difficulty using a projector. I have a MBP 17" and am running 10.6.8. Often I need to make a Powerpoint or other presentation at a client and I want to connect my computer to their projector. Either it won't display on the projector at all. Once it displayed but the presentation mode was on the big screen and the presentation I wanted to show was on my MBP screen. I have the adapter( white ones) to attached to the projector cables. I am so frsutrated...it looks so silly not to have a computer work during a presentation..
Another problem one the rare occasion that it shows on the screen is that the presentation does show just my desk top. Any ideas?
Thanks !

You often have to turn off Mirroring to be able to set the second "screen"s resolution to something reasonable. When you do, the two screens become an "Exceeded Desktop" joined along one edge, and the Arrange pane in displays prefs can allow you to specify what edge. Initially, it will show a vacant extension of the built-in screen's desktop.
The mouse moves freely across that shared edge, and can allow you to drag the presentation window across to the the projector screen and re-size it to fit.

Browsers drop internet connection seemingly at random, solved by reboot

Throughout the day on my MacPro, my browsers will lost their connection to the internet which is immediately solved by quitting and restarting them. This happens in Safari, Firefox and Chrome. There's no specific action I can take to replicated the problem, but it seems to happen more after watching a streaming web video.
When this happens my internet connection as a whole is uninterrupted - FTP transfers and streaming radio continue. Note this problem also happens when I have no network activity going on in the background as well.
Is this a common issue? Is there a likely culprit?

Possible solutions:
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the pop up window click the Diagnostic button.
System Preferences/Network- Unlock padlock. Highlight Airport. Network Name-select your name. Click on the Advanced button. Airport/Preferred Networks-delete all that is not you.
Place a check mark next to "Remember networks this computer has joined." Click the OK button and lock the padlock. Restart your computer.
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/HT1401
Try posting in the Airport Extreme forums-http://discussions.apple.com/category.jspa?categoryID=140

My mac mini keeps dropping wifi connectivity

Hi Folks,
My new Mini keeps dropping wifi connectivity so I lose the connection to Apple TV and even just browsing on Safari seems painful hoping a page will load before losing connectivity. I reset my router, restart the mini and it intermittently keeps happening. Has anyone come up with a workable solution?
Thanks

Hi Leo, this has worked for a few...
Though all of these steps may or may not be needed, I'm including them all.
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
10.5, 10.6, 10.7 & 10.8…
System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.
10.5.x/10.6.x/10.7.x/10.8.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
If using Wifi/Airport...
Instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.
For 10.5/10.6/10.7/10.8, System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...
208.67.222.222
208.67.220.220
(There may be better or faster DNS numbers in your area, but these should be a good test).
Click OK.

Help needed to troubleshoot why my MacBook Pro repeatedly drops wifi connection

We run Mac & PC laptops, iPhone, iPad on occasion, with ATT DSL, 2Wire 2701HG-B Router. First 6 months of enjoying my Mac, no trouble. Then things started to go south. Been dealing with this problem of dropped internet connection for over a year. Got a new router--the 2Wire 2701, finally got a new phone line put in from the outside to inside. It now seems like the MacBook Pro drops the signal far more than the PC. It seems worse when I'm at my desk, which is only a room away from the router. It can drop the signal about every 3rd or 4th click on the internet. The Networks Diagnostics will show red buttons on the Server and Internet. Been testing other areas of the house, and find it seems better in these other areas, dropping far less. Hard to tell, because the problem comes and goes, like the sun. iPhone has dropped connection on occasion. iPad has occasional slow download of YouTube. Neither of those are troubling.
I tried checking with the Airport Utility, but it tells me it can't find any Airport. I obviously understand very, very little of this. Any help would be appreciated.

Which os are you using?
Change your router channel. Sometimes this is all you will have to do.
Power cycling the router. Read the router's user manual or contact their tech support for instructions.
System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the popup window click the Diagnostic button.
System Preferences/Network- Unlock padlock. Highlight Airport. Network Name-select your name. Click on the Advanced button. Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined." Click the OK button and lock the padlock. Restart your computer.
http://support.apple.com/kb/TS1920 Mac OS: How to release and renew a DHCP lease
No internet connection (wireless)
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."
Other resources to check into:
Troubleshooting Wi-Fi issues in OS X Lion and Mac OS X v10.6
Netspot
How to diagnose and resolve Wi-Fi slow-downs
Pv6 troubleshooting
Mac OS X 10.6 Help: Solving problems with connecting to the Internet
What Affects Wireless Internet?
Solutions for connecting to the Internet, setting up a small network, and troubleshooting

Airports with clients off ethernet dropped off quite often

I have multiple situations that have the same similarities and the same problem:
Airports and/or Expresses joining and or extending a network, and which have clients connected to their ethernet ports, have those clients quite often dropped off the network and internet access for those clients as well is lost. In a few words the IP addresses from the main router are gone.
Basically, while it works great for a day or two, the Airport joining the network either goes flashing orange or the clients off its ethernet port do, if they are other Airports, and they disappear from the network. A power reset of the joining Airport or the clients or both restores functionality. This happens only on networks that are extended, not older ones who are WDS networks, and it may be related to that, the newer hardware, and/or firmware levels, etc.
I have only seen this happen with the new(three antennas) Extremes and Time Capsules. Personally, I never had a problem until I replaced my older Time Capsule with one of the new ones and then drop offs started, first of the new Time Capsule acting in that capacity, and then when I moved it off to a different location and it no longer had clients hanging off its ethernet ports, and replaced it with an Airport Express which took over the clients visa the same switch I have been using for a couple of years. Now, the Airport Express goes flashing yellow. The Time Capsule hasn't had a problem in the same time. So, the problem is with Airports joining a network and distributing IPs given to them from the main router. They just can't do it for too long.
This has caused me great strain with a couple of clients and recently in my own setup. I initially thought it was interference, but in my own place I know what is and isn't happening. It's not that.
Anyone else seen this with the new hardware either in a new setup or inserted in a fine functioning network?
Message was edited by: Zebra1

Even with 4 GB my iMac 7,1 wasn't a speed demon in Lion, upgrading to 6 GB made a world of difference, but I still run out of RAM... wish it could take 16 GB or more.
Open Activity Monitor in Applications>Utilities, select All Processes & sort on CPU%, any indications there?
How much RAM & free space do you have also, click on the Memory & Disk Usage Tabs.
In the Memory tab, are there a lot of Pageouts?

Why does my iphone 4 keep dropping wifi connection since ios5.0.1update

Why does my iphone 4 keep dropping wifi connection since ios5.0.1 update, it worked perfectly before, my wifes 3gs connects fine and stays connected while my £400 paperweight losses connection, thinking of going back to nokia! Sort it out apple!

If the "oh so Great Apple" were to monitor these forums then they might see all the problems
that the people who have paid good money for their devices are having, i suppose they can do no wrong
In your eyes, i just thought that if you pay a lot of money for a product that works fine, and you update
It with a firmware update that they kept going on about how good it was and it can do this and it can
Do that, then i think they should sort it out. I don't care if i "don't deserve to be an apple owner" or not,
The fact is i paid my money and it should do what its suppose to do, i moved from Nokia to Apple because
The N97 was crap and i put up with it for too long, and they didn't do anything to fix the bugs they just stopped
Selling it and basically said tough s**t, so now this is happened i hoped Apple whould be better but they seem
To be just like the rest.

TS1398 iphone 5 and sky hub? My phone connects intermittantly and quite often cannot find the network. Also does not reconnect automatically? Any ideas?

My phone connects intermittantly and quite often cannot find the network. Also does not reconnect automatically? Most of the time says unable to join network? My laptop and ipad seem fine? Very annoying Please help!

All the information you need is right here: http://www.apple.com/iphone/specs.html
Notice there is no mention of WiMax.
It doesn't really matter anyway as Sprint is rolling their WiMax network down for use by MVNOs. Actual Sprint customers will not have access to WiMax at all. It was a failed experiment.

MacBook Pro randomly drops Ethernet connection.

I use my new MacBook Pro both connected wirelessly and via Ethernet to my home network. My network is connected to ADSL via a firewall/gateway router. I have a Powerbook G4 and a WinXP machine running on this same network (wirelessly and wired) without any issues.
For some reason my new MacBook Pro, however, will randomly drop off the network and will often require a reboot to reacquire a DHCP address. At first, I noticed this when transferring large amounts of data to the laptop across the network (retiring my XP machine). I thought I may have a bad cable or bad port on my hub so I switched both. After a couple more transfers, however, the problem seems to have returned.
Mid transfer, the MBP will lose connectivity to the DHCP server and assign itself a 169 address. I am unable to reacquire a 192 address from DHCP and have to restart the MBP to get back on the network.
Needless to say, this is very annoying and not at all what I expected with my new MBP.
Any thoughts appreciated as I am at whits end on this one.

I am having a similar issue. I have not yet tested with standard Ethernet, only Wireless using WPA2.
I have 3 Macs (iBook G4, PowerMac G5, and MBP (Core 2 Duo) all connecting a private wireless network consisting of a Airport Extreme and an Airport Express using WDS. All computers and basestations are running the latest versions of their respective software (10.4.8, V5.7, V6.3)
ONLY the MBP has the following problems: dropping the connection, failing to reconnect after sleep, and failing to obtain an IP address via DHCP after connecting.
The signal power reported by both the menu-bar widget and the Internet Connect application varries continually on the MBP, even though it is sitting 2 feet from the Airport Extreme basestation. Sometimes full strength, sometimes only two bars.
I have removed all preferred networks from the Network system preferences and re-added only my network. I have also removed the passwords for the routers from my keychain.
The MBP will often-times simply drop it's connection. When it does that, it will not automatically reconnect to my network. If I put the MBP to sleep it often-times will not reconnect when it awakes either. Sometimes it does, but I cannot decern a pattern. If it does automatically reconnect it will usually not obtain an IP address from the basestation.
Simply toggeling the MBP's Airport off and then on will almost always get it to find my network and automatically connect. Even if it does connect to the network, it doesn't always obtain an IP address via DHCP. Again, if I simply toggel the MBP's Airport off and on then it will usually connect and obtain an real IP address.
All of these things happen within two feet of the basestation, as well as more than 20 feet away. Both other Macs continue working just fine even while the MBP is having problems.
This is not an issue with the basestations or my configuration. It must be a problem with the drivers for the Airport card in the MBP.

Clients seem to drop their connectivity intermittently

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