Posted: Sat May 16, 2020 19:39 Post subject: Wireless speed is 100 mbps slower than directly connected
Screens of configuration at the botttom
Router info:
Router model: Netgear WNDR3700 V4
Firmware version: DD-WRT v3.0-r40559 std (08/06/19)
Kernel version: Linux 3.18.140 #49356 Tue Aug 6 03:48:00 +04 2019 mips
CPU model: Atheros AR9344 ver 1 rev 1.2 (0x2122)
I have a linux server that runs my media hardware that is directly connected to the router, I'm supposed to get 200 down from Comcast, and I get 175 directly connected from that Linux box, but I can't surpass 25 down when I'm connected wirelessly to the router via PC or mobile device. So the device that runs the speed test doesn't matter, wife and I have brand new windows laptops, still can't beat 25. Mobile? 25 down. I've followed the QCA wireless settings here (https://wiki.dd-wrt.com/wiki/index.php/Atheros/ath_wireless_settings#Channel_Width), I've toggled with various settings and numbers, the channel I've moved around, again, 25 down is the max I can get on any speed test. I have not dabbled with the 5 ghz settings yet, only 2.4.
Posted: Tue May 19, 2020 13:23 Post subject: Re: Wireless speed is 100 mbps slower than directly connecte
Per Yngve Berg wrote:
Use channel 1, 6 or 11
Prefer these 2.4G channels to start...
If you need some tool to decide, I use old version of inSSID that shows a link score on (my) SSID (higher is better), I started with with 20Mhz fixed in the router setting moved from lowest to highest channel marked channels with higher scores (1, 9 and 13 for my domain, so I selected 9 + 13 for 40Mhz devices) as best. I used the location with the slowest/weakest WLAN reception, but you may prefer a different one (game pc, streaming TV ....)
Additional :
Try "Channel Width" WIDE HT40. With WIDE setting 40Mhz and 20Mhz clients connect on my router, MIXED did not do the job. Check pads and mobile phones and other devices with integrated WLAN like TV/streaming box that they are able to connect, on failure use the previous setting
Use wireless network mode "NG-Mixed" and check
"Short GI" enabled (for speed)*
"Short Preamble" enabled (for speed)
"WMM support" enabled (for speed)
*enable if you use N and AC clients only, B/G only clients without N support may break/crash your WLAN and need that disabled
Check that you have correct security setting for N and AC support (WPA2 CCMP 128 bit AES)
If you have (older) Intel WLAN on laptop check the WLAN adapter settings :
1. 811.n channel width for 2.4G Band : auto (default 20Mhz)
-> same for 5G : auto
2. Fat channel intolerant : disable (default disable)
Meanwhile my desktop PC that is hardwired (via ethernet) to my router routinely gets 225 Mbps.
Not sure where the problem lies. Is there any way to determine if this is a problem with the router, with DD-WRT, or with my wireless card (Intel Dual Band Wireless-AC 7260) in my laptop?
Not sure where the problem lies. Is there any way to determine if this is a problem with the router, with DD-WRT, or with my wireless card (Intel Dual Band Wireless-AC 7260) in my laptop?
Manufacturer/Model/version of your device ? For older hardware (WLAN chips) the newest builds could be problematic. It depends on the CPU/WLAN main chip used...
post a screenshot from your 2.4G WLAN settings.
don't use auto channel, use n/g mixed and wide 40Mhz
1. You need to use correct security setting :
WPA2 (Personal) CCMP-128 AES
2. Short GI" enabled for speed for N (144/150+ Mbit) clients
3. "Short Preamble" enabled (for all clients except very old b 11 Mbit hardware)
4. "WMM support" enabled
5. "Noise Immunity" disabled (for compatibility with non Atheros/Qualcomm WLAN clients)
6. "Airtime Fairness" disabled (for weak/bad hardware)
7. Your Intel WLAN card settings need "Channel Width for 2.4G "auto" and "Fat Channel Intolerant" disabled
8. Check with one WLAN client and add one by one and check if the WLAN speed degrades by adding a specific client. One client is able to slowdown your WLAN, if the signal is bad, sending and receiving takes more time blocking the other clients, or generating a lot of retransmissions due to bad connection.
Not sure where the problem lies. Is there any way to determine if this is a problem with the router, with DD-WRT, or with my wireless card (Intel Dual Band Wireless-AC 7260) in my laptop?
Manufacturer/Model/version of your device ? For older hardware (WLAN chips) the newest builds could be problematic. It depends on the CPU/WLAN main chip used...
post a screenshot from your 2.4G WLAN settings.
don't use auto channel, use n/g mixed and wide 40Mhz
1. You need to use correct security setting :
WPA2 (Personal) CCMP-128 AES
2. Short GI" enabled for speed for N (144/150+ Mbit) clients
3. "Short Preamble" enabled (for all clients except very old b 11 Mbit hardware)
4. "WMM support" enabled
5. "Noise Immunity" disabled (for compatibility with non Atheros/Qualcomm WLAN clients)
6. "Airtime Fairness" disabled (for weak/bad hardware)
7. Your Intel WLAN card settings need "Channel Width for 2.4G "auto" and "Fat Channel Intolerant" disabled
8. Check with one WLAN client and add one by one and check if the WLAN speed degrades by adding a specific client. One client is able to slowdown your WLAN, if the signal is bad, sending and receiving takes more time blocking the other clients, or generating a lot of retransmissions due to bad connection.
Thank for the suggestions. I'll give them a try in a day or so (I'm swamped at the moment). My router is a Netgear WNDR3700 V1. I've attached a screenshot of my current wireless settings.
Joined: 21 Jan 2017 Posts: 1783 Location: Illinois Moderator
Posted: Thu Jun 18, 2020 19:49 Post subject:
Your settings are following my best settings guide...I would take a look at the Status>Wireless Tab of the gui and see what the clients are connecting at. 2.4ghz is a total crapshoot for HT40 mode on clients. Nearly 95% of all phones and tablets will never allow HT40 mode if they detect neighboring wifi-which is nearly everywhere unless you live on a farm or far far away from neighbors.
This means your speed will be capped to 144.4mbps (MAX THEORETICAL). In real life you can expect between 1/3 and 1/2 of that speed under best possible conditions. So if you get 48-72mbps using 2.4ghz, you're maxxed out and won't get anything better no matter what you do...the black magic of wifi won't go much faster than that on HT20 from the client end. Don't forget to factor in distance away from the router (signal strength) and Viola...25mbps is the best you're getting... I would test 2-4 meters away from the router to see what the maximum speed is...and realize it'll be half that elsewhere in your house/apt. _________________ FORUM RULES
Joined: 30 Jun 2014 Posts: 61 Location: California
Posted: Fri Jun 19, 2020 22:25 Post subject:
For reference, here is the real-life performance I see using a pair of WNDR3700v4 connected with WDS. There is nothing particularly exotic in my layout as you can see from the fantastic ASCII art below.
I have followed the set-up suggestions the others have already mentioned (and I thank them for the guides). And I live in a moderately dense area of Los Angeles so these speeds should be obtainable in most environments.
Connected to the remote WAP, I get a 45 Mbit/s download speed using a laptop. My old iPhone can only manage 15 Mbit/s.
The observant may question why I use 2.4 Ghz channel 3 which is counter to all normal advice. Channel surveys consistently show the best quality on this frequency. Typical quality measurements are: chnl 1 50, chnl 6 60, chnl 11 45. Of course, YMMV.
