Wireless Network Problem !

Posted on 2009-07-16
Last Modified: 2012-05-07
I been using a U S Robotics Max G Wireless Modem Router for a couple of years and it has performed perfectly without a problem. However, a few weeks ago the ADSL performance started to drop and then the device would not connect at all.

I therefore bought a new Belkin F5D8631-4 and ADSL was restored immediately but the wireless performance was patchy with some devices struggling to connect and speed very slow. Nothing, like the previous rock solid performance of the U S Robotics Max G.

I then bought a Netgear DG834GT (I had read that it was a very stable "bomb proof" device) and again, ADSL performance was good and the wireless performance was definitely better than the Belkin. However, after just 24 hours of use the Netgear wireless performance has a problem as well.  We have a laptop that connects wirelessly to the Netgear for ADSL access. This will work perfectly for several hours but then suddenly the wireless connection with the Netgear DG834GT will be lost with the message "Acquiring Network Address". Rebooting the DG834GT restores wireless access to the laptop immediately.

Can anyone please advise what the problem is ?

The devices on the Network (but not all connected at once) are as follows :

Windows PC (connected via LAN cable)
Windows laptop (intermittent disconnections)
iPhone (rock wireless solid connection, never fails)
Logitech Duet Music Server

Any helpful advice would be much appreciated.

Thank You
Question by:technojunkie
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LVL 88

Expert Comment

ID: 24873339
Have you upgraded the router's firmware? Tried other channels? If all your devices know "g" mode, made sure to set the router to "g" mode only (not auto)?

Author Comment

ID: 24874316
Thanks for the post rindi.

I have upgraded the routers software and changed channels but this has had not resolved the problem. The router is set to b & g only ! The speed of the wireless network has slowed down dramatically, particularly to the laptop.

Our wireless network has been as steady as a rock for the past 3-4 years but, all of a sudden, over the last 5-6 weeks we have had nothing but problems. We haven't acquired any new electrical items that could cause interference and I have scanned all local wireless networks to ensure our router is set to a different channel.

I'm on the third (including the US Robotic MaxG) wireless modem/router in 4 weeks !

Any further help would be much appreciated.

Thank You

Author Comment

ID: 24876114
Any further help in this matter would be appreciated.

Thank You
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LVL 88

Expert Comment

ID: 24876469
If you still have B devices on your LAN, set the router to only B mode. If you don't have any B devices, set it to G only mode and leave out B from the router.

Did you try more than 2 or 3 different channels? Did you make sure to change the router's SSID to something other than the factory defaults?

And, maybe a stupid Question, but as many routers use similar power-bricks and probably work with those of other manufacturers, are you sure you also changed that and are not still using the old USR powersupply for your new router?
LVL 44

Expert Comment

ID: 24877502
> ... I have scanned all local wireless networks to ensure our router is set to a different channel.

What channel are you using?
You (and the others) should stick to channels 1, 6 and 11 in the 2.4GHz band. Channels within 5 of other channels have overlapping frequencies which can cause interference with adjacent channels.

Author Comment

ID: 24878441
Thank you for the further responses.

I currently have the router on channel 13 as other routers in the local vicinity are on channels 6, 7, 8 and 11. Should I use a different channel ?

This morning I connected the laptop to our home wireless network (after rebooting the router) and ran a Broadband speedtest. The laptop managed 1400kb/sec download and 376kb/sec upload. I then ran the same test on my iPhone (connected to the same wifi network and sitting next to the laptop) and got 3950kb/sec download and 371/upload.

Why is there such a big difference between the iPhone and laptop speeds ?

Thanks again for the support.
LVL 88

Expert Comment

ID: 24878687
Try channel 1.

The OS can make a difference, as well as background processes. The laptop is probably doing other things at the same time, it may also be using the internet connection for updates etc. There are a lot of things that can influence the speeds.

Author Comment

ID: 24886726
I have tried channel 1 on the Netgear DG834GT and for a while things seemed to improve.

However, the wireless performance is still very inconsistent. I monitored the router RSSI on the laptop using a program called inssider and the RSSI constantly fluctuated between 55 and 62 over a period of seconds. The laptop was sited in the room directly below the router with only a wooden floor and plasterboard ceiling seperating them. Surely the sinal should be consistent and not continally fluctuate !

Eventually, wireless performance gets worse and worse but restaring the router always restores network wireless performance instantly.

I have also disconnected the Netgear and tried the Belkin F5D8631-4 but exactly the same prolem prevails.
LVL 44

Expert Comment

ID: 24887889
Backup the settings on the router... that function is typically located in the Maintenance section of Netgear setups, and is usually called Save Current Settings and has a Backup button to start it.
On Belkins it's typically in Utilities, and the option is called something like Save Current Configuration.

Then do a 30-30-30 reset on the routers.

After you've done that, reload the settings using the saved settings files.

See if the wireless on them is stable after that.

Author Comment

ID: 24890285
Thank You for the post Darr247.

I reset both routers several times but this didn't resolve the problem.

However, I have now resolved the main problem by changing the MTU on both the router and the laptop. I now have wireless internet connection speeds on the laptop varying between 1400kb/sec and 3900kb/sec which was previously unachievable. Web access on the laptop has now improved significantly but another problem has now manifested itself.

My wife is a consultant for Pampered Chef and spends a lot of time on the laptop placing orders and downloading information from the pampered Chef website. We can now access all websites using the laptop at respectable speeds except the Pampered Chef website which is now either extremely slow or times out completely. I can access the website from my PC (wired LAN connection) but not via the laptop.

What could be the problem ?

Thanks again for the posts.

Accepted Solution

technojunkie earned 0 total points
ID: 24929709
I have resolved the first problem by changing the MTU settings on all devices. I have also now resolved the second problem by deleting all temporary internet files and cookies.

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