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dnasir
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Joined: Sat Jan 02, 2016 3:46 pm

Slow wifi speed compared to wired (30Mbps vs 60Mbps)

Sat Jan 02, 2016 4:11 pm

Hi all,

I'm new here, and I registered specifically to solve my problem with my RB951G-2HnD.

I'm using this router at home and I've been trying to figure out why the wireless speed is significantly slower than wired. I have a 60Mbps DSL connection to my house, which runs through a modem/router provided by my ISP (Lattelecom), which in turn is connected to the Mikrotik router. Everything else connects to the Mikrotik router whether via LAN or wireless.

However, running the speedtest.net internet speed test, I get 60Mbps on all devices connected via LAN and around 30-35Mbps on all devices connected via wireless. Is there any particular why reason this is happening?

This is my wireless setting using the "/export" command. As you can see, there's not much going on because it's mostly default.
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n channel-width=20/40mhz-Ce disabled=no frequency=2442 mode=ap-bridge ssid=XXXXXXXX
Any help would be appreciated.
 
robertkjonesjr
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Posts: 37
Joined: Tue Jul 03, 2012 1:39 am

Re: Slow wifi speed compared to wired (30Mbps vs 60Mbps)

Tue Jan 05, 2016 12:46 pm

frequency=2442
This is an unusual frequency selection; typically, channels 1/6/11 are chosen and this is channel 7.

Since this is 2.4GHz, I am not sure how much more you expect to get. 40MHz is unusual for 2.4GHz as many devices and APs will not even do it (i.e. Cisco and Apple, for example), and even if capable in the configuration, there are protection mechanisms that can force it to be off in operation. I don't know exactly what Miktrotik does with 2.4GHz/40MHz, as it's not that useful to me (I move to 5GHz band for all real work) but they should be able to tell us. They probably won't, but they could.

So assume you are not getting 40MHz bandwidth, and I don't know how many streams you can do on your clients. But say you are at n rates, from http://mcsindex.com/, single stream, 20MHz, you are looking at 65 or 73Mbps. So say half of that is real throughput at transport layer (for TCP, etc), and you would have about 30-35Mbps. Seems consistent to me, if the assumptions hold of single stream client.

In one of the wireless tabs the Mikrotik will tell what connection speed the client is connected at. What does this say? It also has a nice feature that shows guard interval and spacial streams. The AP looks like it can do 2x2, so theoretical rates of 144Mbps is possible (at 20MHz/SGI/2x2).

Suggest you set up some iperf clients and servers on your local network - I would use iperf on a wireless client and iperf on a wired machine as server and use this as my throughput test to evaluate my local network.
 
npero
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Joined: Tue Mar 01, 2005 1:59 pm
Location: Serbia

Re: Slow wifi speed compared to wired (30Mbps vs 60Mbps)

Tue Jan 05, 2016 1:18 pm

30-35Mbps very nice. In my flat on 2.4GHz because lots of interference from other device in neighborhood If I can get 20Mbps I am very happy.
Of course look prevision post there lost of helpful information about channels, used chains...


To get result near to 60Mbps you need to enable both chains on 951G by default is enabled also some thing to client, client must have dual antenna lots of devices not have it usually cheap devices and mobile phones, you are already using extension channels it is also needed. And finally get rid of interference turn off other devices using 2.4GHz if you living in city it is impossible. After that test speed.
 
dnasir
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Re: Slow wifi speed compared to wired (30Mbps vs 60Mbps)

Fri Jan 08, 2016 12:51 am

Hi,

Thanks for the suggestions. I'll give them a go.

But I find it quite interesting that 30Mbps is considered good for this router, considering there are many other routers out there that would allow me to get better speeds. Maybe I'm missing something, and all wireless routers in this category do max out at 30Mbps.

I'm going to run some tests using the router provided by my ISP and see if this is really the case. I'll report back my findings.
 
robertkjonesjr
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Posts: 37
Joined: Tue Jul 03, 2012 1:39 am

Re: Slow wifi speed compared to wired (30Mbps vs 60Mbps)

Sun Jan 10, 2016 2:32 pm

But I find it quite interesting that 30Mbps is considered good for this router, considering there are many other routers out there that would allow me to get better speeds.
This is an assumption without any data. There are many limitations as to the throughput; using 2.4GHz provides for generally low bandwidth.

I look forward to your results, but can share some of mine. Basis - iperf with a Linux server on the other end; wired bandwidth through infrastructure is ~940Mbps with single stream TCP iperf, so full line rate:

1. MacBook Air which is 80MHz / 2x2 / 802.11ac capable - to a 3x3 ac access point (different vendor):

Connection rate: 867Mbps as reported by the MAC

[ 5] local 192.168.1.10 port 5001 connected with 192.168.1.228 port 49366
[ 5] 0.0-15.0 sec 860 MBytes 480 Mbits/sec
[ 5] MSS size 1448 bytes (MTU 1500 bytes, ethernet)
[ 4] local 192.168.1.10 port 5001 connected with 192.168.1.228 port 49369
[ 4] 0.0-15.0 sec 894 MBytes 500 Mbits/sec
[ 4] MSS size 1448 bytes (MTU 1500 bytes, ethernet)

2. Same device to my CRS125 switch with built-in 2x2 802.11bgn AP

Connection rate: 145Mbps as reported by Mac

5] local 192.168.1.10 port 5001 connected with 192.168.1.5 port 49397
[ 5] 0.0-15.0 sec 91.0 MBytes 50.8 Mbits/sec
[ 5] MSS size 1448 bytes (MTU 1500 bytes, ethernet)
[ 4] local 192.168.1.10 port 5001 connected with 192.168.1.5 port 49399
[ 4] 0.0-15.0 sec 113 MBytes 63.2 Mbits/sec
[ 4] MSS size 1448 bytes (MTU 1500 bytes, ethernet)

I can't easily attach a screen capture of winbox to show the connection rates, but it is consistent with what the Mac reports. CPU usage is around 75%. This is a perfect test; I am close to the APs and the system is engineered to show maximum possible bandwidth. So it might be possible to get the rates you want, if everything falls your way... if you have little interference, if you have 2x2 clients, if you use prudent channel selection, if...

The results are obvious to me that 802.11ac is real and performance is superior. I use 2.4GHz for guests and legacy. Anything that really needs to the use network gets 5GHz. Not all 802.11ac is the same, it is unusual that I find an AP or wifi system that gives this good throughput - but it is possible.
 
dnasir
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Re: Slow wifi speed compared to wired (30Mbps vs 60Mbps)

Mon Jan 11, 2016 7:16 pm

Looks like you guys might be right. I ran speedtest.net at work, where we have a 100Mbps/100Mbps optical connection hooked up to an Asus RT-AC87U, which is a dual-channel router, and I got similar results when running on the 2.4Ghz band. I then switched over to the 5Ghz band, and I immediately got the full 100Mbps.

So yea, looks like the 2.4Ghz tops out at about 35Mbps. Time to upgrade, perhaps? :lol: :lol: :lol:

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