Netgear N600 2.4GHz Channel - Suddenly Slow Connection

Brotuulaan

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Apr 30, 2013
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I have a Netgear N600 (WNDR3400v2, V1.0.0.52_1.0.81), and just about 1-1/2 - 2 weeks ago, the 2.4GHz band speed dropped significantly. I can't say exactly how fast it was before, but it is now running between 10-25Mbps/average.

As a result, our media streaming (Netflix, YouTube, etc) are now often pausing to buffer as well as dropping quality. My XBL (360) connection to servers in BF4 is showing no higher than 4/5 bars and often less (never 5 anymore), whereas it used to be mostly solid 5/5 bars except during storms and high usage in our apt complex/area (nights/weekends).

The 5GHz band, however, seems to be unaffected. I've plugged my wife's laptop into the modem directly, and it showed around 80Mbps, and my desktop wi-fi connection via 5GHz usually shows around 70Mbps, depending on weather and high traffic times.

That same desktop, however, when connected to the 2.4GHz band, shows the same as the Wi-Fi connection on my iPad, my iPhone, my wife's laptop, and my Xbox (as far as an Xbox 360 details its connection, anyway), and that is consistently around 25Mbps or less. I've given it a fair amount of time and testing (consistent checking each day for these past several weeks), so I'm positive it is not a temporary issue.

But here's where it gets really sticky: I thought that perhaps the 2.4GHz band on my router was going out, so I borrowed a friend's Linksys router (WRT120N) to check the speeds on it, run as an AP from my N600, and it shows consistently the same speeds as my N600's 2.4GHz band. If the router was to blame, then this router must have the exact symptoms, so I thought perhaps it was the broadcast channel.

I downloaded WifiInfoView and checked the local wi-fi channel usage, and nobody's in the same channel range as my networks. I still tried changing the channel on the Linksys and my N600, but that yielded no positive change.

We live in a small apartment, so there is no range issue involved. There is only one wall between my Xbox and the router, and the walls here are fairly thin, so that is not an issue. We have no wireless phones aside from our cell phones, so that is not an issue. Our microwave and other similar devices are not running when I check the speeds, so that is not an issue. The speed seems to be the same regardless of how many devices I have connected, so that is not an issue.

My wife is usually a lot more fine with lesser technological goodness than me, but even she's been having issues with her laptop connection since this began, and I'm about at the end of my rope trying to figure this out. Does anyone have any ideas for me to try?

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Region: North-Central Arkansas
ISP: Suddenlink
Service: 75Mbps (down)
Router: Netgear N600 (WNDR3400v2, V1.0.0.52_1.0.81)
Affected Devices: Xbox 360, iPhone, iPad, Toshiba Satellite, Custom Desktop
Connection Via 2.4GHz Band: 25Mbps-less
Connection Via 5GHz Band: ~75Mbps
 

Brotuulaan

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Apr 30, 2013
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Oh, and curiously enough, the upload speed seems to be fine. It generally tests between 5-10Mbps regardless of router, client device, or band. It even reads higher than the download speed, should the download speed drop to unusually low speeds, which is altogether too often. Whatever it is, it's not throttling everything, just limiting the top end of the traffic flowing through the 2.4GHz range.

And right now, my ping is reading ~100 and higher. It usually reads ~15. Don't know if that's just a temporary, unrelated thing or related to the main issue.

***
UPDATE
***

I just decided to go through all the channels one by one, despite seeing no difference in 7 distinct channels (2, 6-11) as far as connection speed. It was initially set to channel 2 (via auto-select), and I jumped to 6, 11, started working my way back, and then filled in the upper channels. I just tried channel 1, and the speed jumped up into the ~75Mbps range.

I tried setting it back to 6 and got the previous results. I set it back to 1 and got the same again. :( Thought it was somehow fixed despite the illogical nature of channel 1 vs 2/etc.

My 5GHz connection isn't at max right now either (just tested about 35Mbps), but there's still a significant drop in the 2.4GHz band (just tested @ .24Mbps down/8.34Mbps up).

On a side note, I'm having some issues with the connection to my router for changing the settings (messing with the broadcast channel, and all that). It keeps giving me this connection error that looks like an IE error tucked inside the Netgear Genie interface, and refreshing after those errors takes a very long time indeed. I'm also getting the occasional error from Fiddler, a small utility that changes the way Windows 8 interacts with network stuff (I don't know what all it does -- I just installed it following a guide to fix an issue with Metro Apps).

It seems to be hanging after every time I change the channel. Plus, it seems to be kicking my iPad out of the network each time I change the channel, which means my iPad automatically connects to another one (slightly irritating). I don't know how fast a router's menu navigation is supposed to be, so I'm not sure whether this is normal or another possible indicator that the router itself is going bad. Now, that is strictly the settings recall and such. The sidebar menu and such are reacting to my clicking in a manner that I would expect out of my desktop icons.
 
You really only should try the channels 1,6,11. Wireless uses at least 20mhz of bandwidth. The channel numbers you see in a router represent only 5mhz of bandwidth. So even though you say to use a particular channel the router will actually use more channels on either side also. The 1,6,11 numbers represent the best choice to not overlap. When you use channel 2 you actually will overlap with someone who picks channel 1 and someone who picks channel 6.

5g does not have as much issue because the channels number represent 20mhz of bandwidth rather than 5mhz Unfortunately the same problem now is coming to 5g since 802.11ac uses 80mhz which is 4 blocks of 5g channels.

There is little you can do except to keep trying other channels. There are tools like inssider (there is a free one I forget too) that have a easy to see display of neighbors. Some routers have this ability also.

If you are configuring the router from wireless you will always get a interruption when you change the channels. It must renegotiate all the security keys etc when you do this. The router should not by itself though change the channel after you select it.
 

Brotuulaan

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Apr 30, 2013
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Thank you for posting. Yes, like I said, I used WifiInfoView to check the network channels being used, so I was able to see that. And I know that the broadcast channel is only the center of the range actually used.

Also, th 80MHz range shift in AC routers won't be as invasive as some might think, since one of the major trade-offs for those routers is their range. They won't overlap nearly as much with other networks range-wise, so there will be a lot more wiggle room in the channel overlap department. I did a lot of research trying to fix this problem, so I've learned a number of things these past few days. One of the things I learned tonight is just how much ability I have to not throw my Xbox controller through the glass on the front of our apartment. About that...

So I decided to swap the two routers and see whether there was something wrong at a deeper level inside the netgear router, which would then be bypassed with the link says in front. When I swapped me, my iPad tests on speedtest.net showed almost a doubling of the general speed on the Netgear 2.4GHz band and no change on the 5GHz band or the Linksys 2.4GHz band. But my connection to the EA servers on my Xbox dropped from 4/5 bars max to 3/5! I switched it back, and I'm happy to see the strongest connections back at 4/5 again!

Why the hell would it get far better on one device and worse on another?! All this is still with the situation of full bars connection to the router itself. None of my devices are missing any bars, whether they measure in /5 or /4.

I'm about to the point where I borrow a friend's ladder to go up into the attic and pull my cat6 cable out that we put in a year ago and run it into my xbox!

This is f*@$ing retarded!