There are of course multiple ways that the internet can fail to work, and there are clearly problems in Lion that some people are experiencing. I have 4 Apple computers, multiple iPads and iPhones on my network and none of my devices have problems with WiFi. Others don't have the problem that many people here talk about with Lion.
Several people have problems like the above, where a working DNS server fixes their problems, or a router change out etc. The issue is that just because your wireless/networking is problematic doesn't mean that you are experiencing "The Lion Wireless problem." Your ISP might have busted DNS, or you might have a really lousy wireless environment that causes your problems and you just think its "The Lion Wireless Problem."
It's important to go through Apple Care and just hound them about it, if you have this problem everywhere. If you don't have it everywhere, then you might seriously have a problem that is similar but completely not "The Lion Wireless Problem."
I hear what you're saying and agree that the problem could be a number of things. However, logic does point to my Lion upgrade as the one issue that is suspect. As an Ex-hardware troubleshooter, I have some basic knowledge of troubleshooting methodology. When I make a system change I do one change at a time and observe the results. To me, Lion appears to be the problem, but I see your point and thank you for reminding me of the depths that troubleshooting can lead one to.
I'm completely with dcloes on this one. Very similar story: a decent wi-fi router (Billion BiPAC 7800N) with over a dozen devices attached to it. iPhones, iPad, Samsung and Motorola Android phones, MBA, Dell Desktop, etc, etc. All have rock solid wi-fi connections. It's only the iMac (mid-2011, 10.7.3) that has a horribly flakey wi-fi connection. Sometimes it will be stable for an hour, other times it will flap multiple times per minute.
I've had a look in the kernel.log file, and it's full of messages like this:
Mar 18 20:55:39 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:56:10 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:56:47 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:57:24 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:58:04 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:58:34 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:59:06 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
Mar 18 20:59:41 Hakone kernel: en1: BSSID changed to 00:04:ed:23:7d:3c
You can see that it's continually re-associating with the base station. I've also installed a handy little app called WiFi Analyzer which will snapshot the state of the wireless connection every second. It's gives a report along these lines:
20:59:35 MandR WPA2 Personal 10 0 -63 -97 34 00:04:ed:23:7d:3c
20:59:36 MandR WPA2 Personal 10 0 -63 -97 34 00:04:ed:23:7d:3c
20:59:37 MandR WPA2 Personal 10 0 -63 -97 34 00:04:ed:23:7d:3c
20:59:38 missing value Open 10 0 0 -107 107 missing value
20:59:39 missing value Open 10 0 0 -102 102 missing value
20:59:40 missing value Open 10 0 0 -107 107 missing value
20:59:41 MandR WPA2 Personal 10 0 -64 -99 35 00:04:ed:23:7d:3c
20:59:42 MandR WPA2 Personal 10 0 -62 -97 35 00:04:ed:23:7d:3c
20:59:43 MandR WPA2 Personal 10 0 -72 -107 35 00:04:ed:23:7d:3c
20:59:44 MandR WPA2 Personal 10 0 -66 -101 35 00:04:ed:23:7d:3c
20:59:45 MandR WPA2 Personal 10 0 -65 -101 36 00:04:ed:23:7d:3c
20:59:46 MandR WPA2 Personal 10 0 -65 -101 36 00:04:ed:23:7d:3c
20:59:47 MandR WPA2 Personal 10 0 -65 -101 36 00:04:ed:23:7d:3c
20:59:48 missing value Open 10 0 0 -104 104 missing value
20:59:49 missing value Open 10 0 0 -106 106 missing value
20:59:50 missing value Open 10 0 0 -101 101 missing value
20:59:51 missing value Open 10 0 0 -105 105 missing value
20:59:52 MandR WPA2 Personal 10 0 -64 -101 37 00:04:ed:23:7d:3c
20:59:53 MandR WPA2 Personal 10 0 -64 -101 37 00:04:ed:23:7d:3c
20:59:54 MandR WPA2 Personal 10 0 -64 -101 37 00:04:ed:23:7d:3c
In other words, the wi-fi connection drops for a few seconds, then comes back, then drops again, then comes back... It carries on like that for a while and finally loses the connection entirely. Manually turning wi-fi off and then on again will fix it -- for a while.
This is VERY CLEARLY a problem with the iMac hardware or device driver software. Apple need to get their skates on and fix this properly!
Another option that worked for me.
I tried to replace the plists in the Library and this did not help.
What did help?
I turned on WiFi on my Pro Mac and that worked okay. (So, something about my MacBook Air and the network with an airport was the problem.)
I took went into the network settings in the system preferences.
I took out the info there from my WiFi setup.
I copied over the info, specifically the info on TCP/IP--the IPv4, Subbet MAsk, and Router.
After I did this, I got a notification on both computers that this info (router or address, I forget) was being used on multiple computers. So I turned off the WiFi on my ProMac, and then things worked fine, for now.
I assume this fix will not last long, but it only needs to work until Apple creates a fix. Hope this helps you.
I tend to agree that this is a software problem with lion itself.
i took my 2008 mbp5.1 to an apple genius, and after a series of tests he agreed the hardware he was testing (i.e my mbp) was in perfect working order.
as soon as the wifi is turned off the problem dissapeares completly, leading me to belive that it could be a kext problem in relation to certain types of airport card.
i also have knowledge of hardware troubleshooting, but i think im going to have to learn about software debugging. not fun.
Yeah, this is officially ridiculous now...mine's still buggy, and takes a good 15 seconds to connect after waking from sleep...my $500.00 iPad? Nanoseconds, and perfectly reliable even 1/2 block from the house. My iMac is 10' from the Apple wireless Wi-Fi station... :-(
Not impressed. Maybe I'll try tech support again....
This is the most persistent problem Apple has had since I joined them in about 1999.
I also had this wi-fi drops problem for a few months. Last December I wired my Imac with an ethernet cable because I had enough of it! Then, two weeks ago, I bought myself a new dual band router. Now my Imac is connected to the 5GHZ band of the router. Since then I have no more problems of wi-fi drops. Internet speed is constant and fast.
Here are my experiences with this issue...
I had an older MacBook Pro with Snow Leopard, which ran fine against my home router (G) and work router (N).
I recently acquired a new Mac Book Pro. 2.5 Ghz, Intel Core i7 with Lion. Had problems with G router at home, it would sometimes drop connections. No problems at work on the N router.
Acquired loaner laptop (Intel Core i7) from my IT department with Lion. Encountered the same problems with connections being dropped at home on my G router. Returned same laptop to IT dept. and loaded Snow Leopard on it. Took it home and it ran fine with the G router.
Apologies to rehash old posts but I think it's safe to say we all know it's a fault with Lion. My iPhone, iPad and windows laptops all work fine with no wifi drops yet my iMac keeps dropping every 10 minutes or so now (which seems to be the case for the majority of people on here). Whilst it's solved by turning the wifi off and on again, nobody should have to resort to this or the many other methods I've read about.
I've been frantically trawling through all imaginable posts relating to this and one thing is constant—regardless if you've reset the PRAM, Renewed the DHCP lease, changed wifi channel, reset router, updated software, etc, people's wifi (including my own) are still disconnecting at random intervals and the issue isn't completely fixed.
As mentioned, there are various ways to temporarily remedy the problem which seem to work for a few people but does anyone actually know if Apple have acknowledged this and working on a fix since the last wifi update a few weeks back? I've yet to speak to the customer support line but in the mean time any other information is hugely appreciated. If I find anything else I'll post back.
What I think is that the Imac reacts more to external interferences. It is known that the 2.4GHz band interfere with bluetooth, cordless phones and other neighbour wi-fi. This may cause the drops. Since I have my new dual band router, I haven't experienced a single drop in Wi-Fi. Internet speed is constant. The Imac is connected to the 5GHz band and it works like it should. I am of course still on Lion with the latest updates.
Thought I'd update my findings. Spoke with D-Link yesterday about my DIR-655 router with Lion. They said this router has a known incompatibility with Lion and their engineers are working on a firmware update, but this could take months, or weeks (tech rep coudn't say).
Since adding the extra 220.127.116.11 DNS entry to the network setings list, wifi drop-outs have ceased entirely. Not a fix, but a tweak that works for my system.
On a side note, my Epson Workforce 635 which worked fine with Snow Leopard, fails to print wirelessly with Lion. It will work if I connect physically. A shame, as my computer and printer can't share the same desk area.