Posted: Thu Feb 28, 2013 15:59 Post subject: WNDR3800: Slow wireless speeds. LAN is fine.
Hello all,
I recently flashed my WNDR3800 to r206750. Everything seems to be up and running fine with the exception of the wireless.
Symptoms:
1)Weak signal one floor below the router which leads to frequent disconnects. This wasn't an issue with stock or OpenWRT firmwares. Normally I get good wireless reception all throughout the house, including the front and back yards. I've boosted the TX power to where it was in other firmwares (27db) and that didn't appear to make much of a difference. I suppose I could take it higher, but I'm concerned that I may fry my router.
2)Download speeds are extremely slow over wireless.
I have a 50 Mbps connection running into my house. I get, at best maybe 13 Mbps down wireless to my PC sitting about 10 feet away. But even that isn't reliable. Normally, it tops out in the 10Mb range. Download speeds over LAN are normal. Upload speeds are fine as well.
To remedy this, I've tried all kinds of different configurations. Setting the network mode to NG-Mixed, G-Only, "turbo", dynamic (20/40hz)...and nothing.
Dropped the firewall and rebooted. No difference.
To avoid outside interference, I switched to using channel 8. No other routers in the neighborhood are on this channel (confirmed by site survey). Just for kicks, I tried 6 and 11 too. No difference. And last but not not least, I've tried playing with the ACK timing. From 0 (auto), 100, 200, 225, 250, 500, and everywhere between 2,000. Still no luck.
So, at this point I feel stuck. I have been googling and reading through the DD-WRT wiki's virtually non-stop for two days and nothing seems to be working for me.
Suggestions?
Last edited by sirchuck on Fri Mar 01, 2013 3:56; edited 1 time in total
And I tried a few suggestions I saw in other posts. Nothing seems to be making a difference. In the screens you can see my config as well as the site survey.
Again, I'm currently on channel 8 so I don't think that's an issue.
Last edited by sirchuck on Fri Mar 01, 2013 1:19; edited 1 time in total
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Fri Mar 01, 2013 3:16 Post subject:
With settings like that no you didnt follow the guide.. anyway try 20MHz.. in a wifi clusterfuck area like that i wouldnt be surprised the performance is garbage. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
With settings like that no you didnt follow the guide.. anyway try 20MHz.. in a wifi clusterfuck area like that i wouldnt be surprised the performance is garbage.
I'm looking at the guide now (again) and I don't see what I'm missing. The screenshot (obviously) reflects what I had set at that time. However, I did say in my first post that I've tried all of these options in various combinations (including 20Mhz G-Only mode) and they have no effect.
Again, my speeds were normal with the stock firmware and easily exceed 30Mbps with OpenWRT.
"Clusterfuck" or no, it is clear that there is a big drop off in DD-WRT.
Joined: 03 Jan 2010 Posts: 7568 Location: YWG, Canada
Posted: Fri Mar 01, 2013 6:56 Post subject:
Same radios/radio drivers in WNDR3700 v1/v2 as WNDR3800, my wireless is fine near same as stock. Have you tried regulatory domain if so what ones besides USA? Atheros units can't fry their radios, even at 100dBm tx power the radio will cap at it's max for X regulatory domain, unlike Broadom units that will force tx power to whatever you select so high they're performance will literately jitter & start dropping, Atheros don't do that. What is the max tx power DD-WRT is reporting for both bands? Use HT20 for now. Oh & ACK timing won't do anything for signal clarity for your situation when all clients are well within max distance, the lowest setting (450m) or 0 is best for absolute max throughput. Short preamble also gives a slight boost.
Also do you know the wifi chips used in the client devices? As well as what is the noise value on the wireless status page as the devices sweat to hold connection? Ignore noise on site survey, i think its broken there.
Another also, try fully disabling protection mode CTS/RTS/threshold if you havnt already. _________________ LATEST FIRMWARE(S)
BrainSlayer wrote:
we just do it since we do not like any restrictions enforced by stupid cocaine snorting managers
is it legal to use another regulatory domain i really wanna use USA but im in Australia, you get that 3db extra, is there anyway for other people to tell what you are on and report you? we have kinda strict laws here it wouldnt suprise me lol. id still be using a channel that is allowed here.
Same radios/radio drivers in WNDR3700 v1/v2 as WNDR3800, my wireless is fine near same as stock. Have you tried regulatory domain if so what ones besides USA? Atheros units can't fry their radios, even at 100dBm tx power the radio will cap at it's max for X regulatory domain, unlike Broadom units that will force tx power to whatever you select so high they're performance will literately jitter & start dropping, Atheros don't do that. What is the max tx power DD-WRT is reporting for both bands? Use HT20 for now. Oh & ACK timing won't do anything for signal clarity for your situation when all clients are well within max distance, the lowest setting (450m) or 0 is best for absolute max throughput. Short preamble also gives a slight boost.
Also do you know the wifi chips used in the client devices? As well as what is the noise value on the wireless status page as the devices sweat to hold connection? Ignore noise on site survey, i think its broken there.
Another also, try fully disabling protection mode CTS/RTS/threshold if you havnt already.
By HT20 I assume you mean 20MHz?
DD-WRT is showing the TX power as 27db, which is what I have it set to. I am able to change the regulatory domain from the U.S. (where I live) to a different country. I did change it to Canada just to see what would happen and still no change in d/l speeds. Regarding the clients, right now it's just my computer and a few mobile devices connected (two iPhones and an iPad). The bottom entry you see in the second screen shot is my iMac, which is maybe ten feet away (with line of sight) from the router. It uses a Broadcom wireless card.
You are correct that unless I am in the same room with the router, clients seem to struggle to hold a connection. If I go downstairs to the living room -- mind you my house isn't very large (maybe 900 sq. ft -- the signal drops. In any case, I've attached screens of my current settings.
sirchuck, did you ever figure anything out? I just picked up a WNDR4300 (very similar hardware) and can't seem to get wifi performance in excess of 25mbit in either direction. It's pretty incredibly crappy.
Edit: under virtually all settings with DD-WRT, my mac reported PHY mode: 802.11a for the connection. Flashed back to stock firmware, it's reporting N and performance is full speed as I'd expect.
Sorry for the late response -- I don't check this email much.
Unfortunately, no I was not able to get anywhere with the WNDR 3800 so I ended up giving it away to a friend. I suspect the issue I was having was a mix between the unit having poor/defective radios to begin with (there's posts about around online), and something with DD-WRT.
I've tested DD-WRT on my Buffalo WZR-HP-G300NH and got similar (poor) throughput over wireless (works fine otherwise). If you search around these forums, I'm sure you will find that this is hardly a unique problem.
Personally, I ended up reverting back to Gargoyle (based on OpenWRT). The interface isn't as pretty as DD-WRT, but it's stable and works really well. If you can't get DD-WRT to go, give that a shot.
OpenWRT is the ticket (I believe it'll solve this PHY mode/speed problem as well as another functionality issue I've got), but sadly it doesn't support the wndr3700v4/wndr4300 yet
For now I'm on stock firmware, hoping openwrt gets figured out soon.
Posted: Mon Nov 28, 2016 18:37 Post subject: same problem except slower
my wndr 3800 was working fine wireless and all that internet speed was good I did a reset and a hrad reset to see if its make destiny work on the same network and now all my wireless internet is slower than shit cant watch videos or nothing cant watch instagram videos on my phone. AND IT WAS ALL FINE BEFORE I HARD resetted I shoulda never resetted my modem
