Draytek Vigor 2765ac really slow LAN wifi

Hi all I recently purchased a 2765ac, I have set it up and the Lan speeds for the WiFi are shocking. I can't get it over 50mbps.

I have followed the steps on the below link without any luck, I have also tried playing with QoS and bandwidth limiting settings. Very tempted to get a refund as I can't find anything about what's causing this issue. 2.4 or 5ghz not making a difference either..

You haven't said what you're testing to and from. Are you testing to a speedtest server on the Internet, or to a local LAN server? Is this via an Internet connection on the VDSL port? 50Mbps can be a perfectly reasonable speed for VDSL, depending on your location.

Potentially there are three different issues here:
- VDSL training speed and/or ISP speed
- routing speed
- wifi speed

The first thing to do is to make a *wired* connection from your test device to a LAN port on the router, and see what speeds you get. Then repeat the test over wifi.

Secondly, show the router VDSL stats - this will include things like the upstream/downstream speed (actual and attainable) and the signal to noise ratio.

If you are not using the Internet but testing to a local LAN device, then another possible issue is your CAT5e cable. If it has a broken pin, this may limit you to 100Mbps (gigabit ethernet needs all 8 pins working, 100M ethernet only needs 4 of them)

Edited by candlerb (Wed 13-Oct-21 14:26:08)

As noted there's a whole lot that can go wrong in WiFi and WiFi setups, leading to pitiful or patchy (or both) performance.

In addition to candlerb's very helpful post, to get the ball rolling perhaps you could also provide further information that would help to pinpoint causes, including:

1. what device(s) (model/age etc) you are using to test with - this can have a *very* big part to play in throughputs
2. provide some background as to how you are testing WiFi - same room, another space - as well as if you have simply adopted your previous WiFi setup or have set this up as a new SSID etc during testing
3. Do you have lots of other nearby WiFi access points from neighbours or is the air peaceful?
4. Paste up some screen grabs (anonymised as needed) of your WiFi router setup pages. You mentioned a link, but there was nothing further in your OP...

I am testing file transfer over Lan. From a device that has a 1gb Ethernet port. When transferring over Lan with both plugged via ethernet it will transfer at 1000mbps as expected.

The device is capable of transferring at 5ghz and can do 1gbp over Lan but I believe configuration on the router is stopping it.

I cannot find a way to fix this and have seen previous posts about the same issue.

In reply to a post by Aferg1233:

I am testing file transfer over Lan. From a device that has a 1gb Ethernet port. When transferring over Lan with both plugged via ethernet it will transfer at 1000mbps as expected.

OK. Can I confirm: when the *same* device is connected via Wifi, it picks up an IP address from the same subnet as it did on the LAN? But you can only transfer at 50Mbps ? And this is the case regardless of whether it's connected at 2.4GHz or 5GHz, and regardless of how close you are to the router?

It might be useful if you could show a screenshot of your wifi settings on both the router and the PC. If either of them is configured for 802.11b/g then that has a raw maximum rate of 54Mbps. That seems unlikely to be the problem though, especially if you're sure you're connecting at 5GHz, and I doubt you'd even achieve 50Mbps throughput with 802.11g.

Have you tried different client devices on the wifi?

Does the router have an option to show all the connected wifi clients, and if it does, does it show the band and the negotiated data rate?

Moreover what is the *actual* device make/model/age that you're testing with? Presumably a laptop (or desktop)? Do you know what wireless card it has in it?

Also how exactly are your measuring throughput or getting the figures quoted?

Yes it has an IP from the same subnet it is not a client issue as when i had a previous router it would transfer over 500mbps. Im sat next to the router trying to troubleshoot so its not a range issue.

Is is on 802.11n

Again what is the client device please?

802.11n will not give you the optimal performance the AP is capable of. For that you need to be connected using 802.11AC (and the widest channel supported by your client)

The client is Intel(R) Wireless-AC 9560 160MHz

I am transferring a test file, figures are from task manager and the file transfer screen.

Right so it ought to connect using 802.11ac (rather than n) using two spatial streams at up to 866 Mbps PHY, if you have set 80 MHz wide channels on the Draytek. For the sake of testing disable the 2.4 GHz band too.

Can you confirm what channel width you have set, on the Draytek. You may also wish to turn down the power of the 5 GHz radio on the Draytek, especially if you are sat right by the AP. High power is often a hindrance and not help.

Subsequent to those changes/checks, what is the Link Speed (Receive/Transmit) shown in the adapter properties in W10?

Edited by Pheasant (Wed 13-Oct-21 16:34:06)

Open a command prompt and type in

netsh wlan show interface

Copy and paste the results in here.

I have used Draytek Routers for over a decade and they are pretty bullet proof. As you'll have seen from the WebGUI there is an overwhelming number of configuration options. Some of those to consider tinkering with is:

Turning off Band Steering to ensure you're connected to the 5GHz band.

In the General Setup for the 5Ghz band ensure you're on a channel that is not crowded and stick to channel 52 or lower to avoid the DFS radar scanning checks. Use a tool like WiFi Explorer or equivalent to discover local spectrum usage of neighbouring WiFi networks. Set the Radio Mode to Mixed to ensure 802.11ac is enabled.

In Advanced settings, switch to Green Field Mode, 20/40/80 Channel bandwidth, set TX power to 30%, enable WMM and change the country code to UK (assuming you live in the UK).

Run your tests again. If you can, use an end to end network performance tool called iPerf3 for testing. There are clients for all platforms including iOS and Android that you can use to test end to end performance. If you're a dab hand with Docker, pull and run a Container for Open Speed Test which is another simple LAN speed test tool.

https://forum.draytek.co.uk is a good place for specialised knowledge and Draytek UK support is responsive (they can be a bit teach you to suck eggs at first).

In reply to a post by Aferg1233:

I am transferring a test file, figures are from task manager and the file transfer screen.

Are you quoting MB/s figures or converting to Mb/s figures?

I have played with these settings with no change. I have just copied a file from the client to the server and am getting over 350mbps but then when trying to copy from the client to the server still only getting 50mbps?

I have factory reset the router and no bandwidth limits set etc and i have upgraded the firmware, i have just spoken to draytek support and they are going to try and replicate the issue in their lab.

Any suggestions?

Copying files as a test is relying on other technology layers like CIFS/SMB/NFS etc.

Try more basic TCP/IP throughput tests like iPerf3

In reply to a post by Aferg1233:

Any suggestions?

Have you checked what the wireless PHY link speed of your laptop adaptor is actually connecting to the AP at?

It *should* be stable connecting at 866/866 Mbps with >=99% signal rate (given you've said your're across the table from the AP) as reported under the W10 adapter settings (either method as noted above).

If its not then then you have a physical connectivity issue that needs sorting first and foremost.

[One of the many nice things on a Mac is the ability too get really good WiFi stats with one button press, but I digress]

The laptop shows as having 866mbps connection, i feel like there must be a config setting for this.

As i said when copying a file from my server it shows 50mbps but then when copying a file from laptop to the server it goes upto 250mbps.

Laptop

Accepted connection from 192.168.1.23, port 61089
[ 5] local 192.168.1.10 port 5201 connected to 192.168.1.23 port 61090
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 7.78 MBytes 65.2 Mbits/sec
[ 5] 1.00-2.00 sec 8.02 MBytes 67.4 Mbits/sec
[ 5] 2.00-3.00 sec 8.23 MBytes 69.0 Mbits/sec
[ 5] 3.00-4.00 sec 8.32 MBytes 69.8 Mbits/sec
[ 5] 4.00-5.00 sec 8.96 MBytes 75.1 Mbits/sec
[ 5] 5.00-6.00 sec 8.78 MBytes 73.7 Mbits/sec
[ 5] 6.00-7.00 sec 8.55 MBytes 71.7 Mbits/sec
[ 5] 7.00-8.00 sec 9.31 MBytes 78.1 Mbits/sec
[ 5] 8.00-9.00 sec 8.72 MBytes 73.2 Mbits/sec
[ 5] 9.00-10.00 sec 8.30 MBytes 69.6 Mbits/sec
[ 5] 10.00-10.06 sec 446 KBytes 63.3 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.06 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.06 sec 85.4 MBytes 71.2 Mbits/sec receiver

Server

Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.1.10, port 60247
[ 5] local 192.168.1.23 port 5201 connected to 192.168.1.10 port 60248
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-1.00 sec 42.0 MBytes 351 Mbits/sec
[ 5] 1.00-2.00 sec 33.2 MBytes 279 Mbits/sec
[ 5] 2.00-3.00 sec 30.7 MBytes 257 Mbits/sec
[ 5] 3.00-4.00 sec 33.6 MBytes 282 Mbits/sec
[ 5] 4.00-5.00 sec 37.2 MBytes 311 Mbits/sec
[ 5] 5.00-6.00 sec 28.6 MBytes 240 Mbits/sec
[ 5] 6.00-7.00 sec 36.4 MBytes 305 Mbits/sec
[ 5] 7.00-8.00 sec 43.2 MBytes 362 Mbits/sec
[ 5] 8.00-9.00 sec 41.4 MBytes 347 Mbits/sec
[ 5] 9.00-10.00 sec 41.8 MBytes 351 Mbits/sec
[ 5] 10.00-10.04 sec 1.59 MBytes 360 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 5] 0.00-10.04 sec 0.00 Bytes 0.00 bits/sec sender
[ 5] 0.00-10.04 sec 369 MBytes 309 Mbits/sec receiver
-----------------------------------------------------------
Server listening on 5201

https://imgur.com/a/Y2uwHCN

Grafana stats from send and receive....

Is the server another windows box or a NAS?

As noted above client server OS-based file transfer tests (because of the extra overhead/bloat) aren't always the best for consistent max network performance tests.

I would suggest you look at running the tests with a dedicated performance throughput tool as suggested like iperf, tamosoft or OpenSpeedtest

I just checked and my Thinkpad x390 uses the exact same Intel WiFi adapter. I can get push around 600/650 Mbps though mine on a Speedtest using AC-based access points.

Pop this on your server and then test from your laptop.
https://openspeedtest.com/speed-testing-application-...

Then install the server app on your laptop and test from your server.

Hmm. I would be inclined to boot the laptop into Ubuntu from a Live USB, and test again (and the server too, if it's running Windows)

If it's a new version of iperf (iperf3), note that you can also initiate the tests in both directions from the same side. Add flag "-R" to do a reverse throughput test.

Hi Aferg1233, did you ever get to the bottom of this? I have a 2762ac with really disappointing performance with Lan, WiFi and wan. When I connect an old plusnet router or the supplied BT hub performance is as you'd expect and on the wan side I get the advertised up/down speeds.

This is using a mix of wired and WiFi devices.

I've read around t'interweb and there's a few posts about slow drayteks..

I've been a Draytek user for 12 years now (2850, 2860 and 2865) and from a Router perspective, I find them bullet proof. Features and reliability are excellent. WiFi is just "OK" though with the 2865 being the best its ever been.

For your LAN & WAN problems what do you see? Can you post your Line Stats for your DSL connection?

My personal preference is to split WiFi completely from the routing. All-in-one is neat/convenient but often or not a compromise. Just depends on personal requirements and user’s situation.

Agreed - I have separate APs for everyday use and only use my Draytek Router itself for a Guest & IOT WiFi network (all isolated off of course).

I solved my Draytek wifi issues with new antenna and turning off the DFS channels, see point 5 of this article.

https://draytek.co.uk/support/guides/kb-wireless-5gh...

The DFS seems to be the cause of random connections drops, since turning off channels 52 and above no random disconnections.

The larger antenna improved the 2.4 GHz range, did not do much if anything for the 5 GHz.