Forum Thread

WNR3500L - how to maximize home network speeds

idlebrain 1,521 786 August 19, 2010 at 06:13 PM
I have this Netgear WNR3500L wireless router at home.

- Laptop running Win 7 with 'n'
- Laptop running XP with 'n'
- LG BD570 wifi supports 'n'
- iPhone 3GS wifi
- Synology DS209 NAS ethernet wired to router

When copying a file from lappy to NAS (it has WD 7200 rpm drive), I am hardly getting 4+ mbps speed. Definetely something wrong with settings or other. Please suggest how I can improve the my LAN speed.

Though router is DDWRT, Tomato compatible, I didn't flashed them. Most of the settings are default.

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#2
Quote from idlebrain View Post :
I have this Netgear WNR3500L wireless router at home.

- Laptop running Win 7 with 'n'
- Laptop running XP with 'n'
- LG BD570 wifi supports 'n'
- iPhone 3GS wifi
- Synology DS209 NAS ethernet wired to router

When copying a file from lappy to NAS (it has WD 7200 rpm drive), I am hardly getting 4+ mbps speed. Definetely something wrong with settings or other. Please suggest how I can improve the my LAN speed.

Though router is DDWRT, Tomato compatible, I didn't flashed them. Most of the settings are default.
Specify what model the 'n' adapters are.
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#3
Have you tested the same operation wired to wired and wireless to wireless?

If you speeds are greatly improved, I would go with the bridge between wireless and wired is the issue. I have a cheap router and have similar behavior. The model you have doesn't look like it's particularly cheap, so you'd expect to get better performance.

Another thing to look at... is your NAS running on Gigabit or 100 Mbps? The NAS appears to be Gig enabled... again, issue could be the bridge between wireless and wired. I recommend testing using your laptops and copy a file from wireless to wireless and see what speeds you are getting and then try copying from a laptop connected by wire to the NAS. It doesn't solve the problem, but may help isolate where the problem is.
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#4
Did you set your wireless to 300Mbps instead of the default 145Mbps?
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#5
remember no matter what protocol of wireless, wired will always be the fastest.
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#6
Maybe iPhone being connected is bringing wireless network down to 54G.

54G = 6.75 MB/s minus overhead, ~4 MB/s

Turn OFF wifi on the iPhone and see if N speeds get better.
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#7
The max rating (54Gb, 150Gb or 300Gb) of wireless connections are under "ideal" conditions (within line of sight of each other, no other signals, no interference, etc.). The more interference, other signals, walls the signal has to go through ..... the more the signal has to negotiate through, the slower the signal gets. Cool
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#8
First off, I think 4MByte/s isn't terrible for N wireless. It's not the fastest, but with wireless, it could easily be worse.

Are your transfers to/from the NAS faster over a wire? Many NAS devices are SLOW.

What channel/frequency are you using? Is anybody else nearby on a closeby channel (try DD-WRT's "site survey" function). Try changing the channel anyway (anything could be interfering, even non-WiFi devices). Channel width?

Try 5GHz if you're on 2.4GHz, and vice-versa (but 5GHz doesn't work for G clients, and 5GHz seems to suck on my Netgear WNDR3300 running DD-WRT). Also, I've read that best N speeds come from WPA2+AES encryption.

Good luck.
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#9
The reason that I asked for the exact model of your adapters is that if they are single stream adapters (1T1R) and you did not explicitly enable 40MHz bandwidth mode then you will be stuck at around 65Mbps connection speeds.

Intel adapters refuse to operate in 40MHz bandwidth mode on the 2.4GHz spectrum to be more "neighbor friendly."
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#10
Thanks to all your responses. I am trying to isolate the issue and switched off all other devices connected to router including iphone 3gs.

My lappy running on win 7 (64 bit) has Atheros AR9285 802.11/b/g/n wifi adapter. I checked the properties - advacned tab - it has the below values:

802.11b Preamble (currently selected)
Adhoc 11n
Network address
Receive Buffers
Scan Valid Interval
Transmit Buffers

I tried to select AdHoc 11n, and click OK, but after re-opening its still showing 802.11b preamble. I did verified the manual of this driver and its 'n' compatible. But I didn't see any corresponding property here.

I tried to play around with 'Channel' setting on router. Channel 1 is yielding around 10 mbps.
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Last edited by idlebrain August 20, 2010 at 03:31 PM
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#11
Quote from redskull View Post :
First off, I think 4MByte/s isn't terrible for N wireless. It's not the fastest, but with wireless, it could easily be worse.

Are your transfers to/from the NAS faster over a wire? Many NAS devices are SLOW.

What channel/frequency are you using? Is anybody else nearby on a closeby channel (try DD-WRT's "site survey" function). Try changing the channel anyway (anything could be interfering, even non-WiFi devices). Channel width?

Try 5GHz if you're on 2.4GHz, and vice-versa (but 5GHz doesn't work for G clients, and 5GHz seems to suck on my Netgear WNDR3300 running DD-WRT). Also, I've read that best N speeds come from WPA2+AES encryption.

Good luck.
I don't believe his router supports 5GHz, but the WPA2 statement is accurate. I was running an N router under WPA and my wireless clients couldn't connect above 54 Mbps. I changed the security profile to WPA2 and I started getting 300Mbps (well, above 54Mbps, noone actually gets the stated speeds!).

Also, setup the Guest network for your iPhone and any other G clients (I believe the stock firmware supports this). Any active G client will force the router to switch to 54Mbps.
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#12
Quote from sarcasmo View Post :
I don't believe his router supports 5GHz, but the WPA2 statement is accurate. I was running an N router under WPA and my wireless clients couldn't connect above 54 Mbps. I changed the security profile to WPA2 and I started getting 300Mbps (well, above 54Mbps, noone actually gets the stated speeds!).
That probably has more to do with the encryption algorithm used. TKIP is more complicated to do than AES and is slower or unsupported on some hardware. WPA supports both TKIP and AES whereas WPA2 only allows AES.
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#13
Quote from idlebrain View Post :
Thanks to all your responses. I am trying to isolate the issue and switched off all other devices connected to router including iphone 3gs.

My lappy running on win 7 (64 bit) has Atheros AR9285 802.11/b/g/n wifi adapter. I checked the properties - advacned tab - it has the below values:

802.11b Preamble (currently selected)
Adhoc 11n
Network address
Receive Buffers
Scan Valid Interval
Transmit Buffers

I tried to select AdHoc 11n, and click OK, but after re-opening its still showing 802.11b preamble. I did verified the manual of this driver and its 'n' compatible. But I didn't see any corresponding property here.

I tried to play around with 'Channel' setting on router. Channel 1 is yielding around 10 mbps.
Yep, that's 1T1R (single stream) and only capable of 150Mbps in 40MHz mode. You should not mess around with the Preamble or Adhoc settings. The Channel setting on your router is different from the bandwidth. If your router's configuration is anything like this WNR3500 Simulator [netgear-forum.com], you need to set the Mode option to 300Mbps on the Wireless Settings page under Setup.
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