topic Wifi Latency in Wireless

Wifi Latency

MuhammadSaad_2 — Sun, 04 Jul 2021 06:11:46 GMT

Dear All:

Scenario is we have three buildings out of three 2 buildings contain autonomous Access Point and One building contain WLC.

the management and user ssid vlan is same in all the buildings. But when end user connect with User SSID and pings its own gateway is show latency.

Kindly help me in this is very urgent.

Thank You

Re: Wifi Latency

Scott Fella — Sun, 09 Dec 2012 12:54:44 GMT

All buildings having issues or just the building with the WLC. Have you checked for duplicate IP address? Is it all clients or just a few? Need more info.

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Wifi Latency

MuhammadSaad_2 — Sun, 09 Dec 2012 13:14:38 GMT

Hi Fella

All Buildings have issue. Vlan is same and IP scheme is also the same, approximately with all clients.

Thank u

Re: Wifi Latency

Scott Fella — Sun, 09 Dec 2012 13:21:11 GMT

So all buildings are layer 2 connected.

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Re: Wifi Latency

Scott Fella — Sun, 09 Dec 2012 13:31:38 GMT

So all buildings are connected via layer 2? Have you seem any duplicate IP address?

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Wifi Latency

MuhammadSaad_2 — Sun, 09 Dec 2012 18:03:32 GMT

Hi Fella

Yes all buildings connected via layer 2 and their is no duplicate IP address conflict.

Thanks

Re: Wifi Latency

George Stefanick — Sun, 09 Dec 2012 19:22:12 GMT

What is the latency ?

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Wifi Latency

MuhammadSaad_2 — Sun, 09 Dec 2012 20:04:22 GMT

when i ping my default gateway the time = 3, time = 18, time-67, time=1, time=90, time=1, time=1, time=55, time=754, time=2.

like this..

Thanks

Re: Wifi Latency

George Stefanick — Sun, 09 Dec 2012 20:27:13 GMT

Have you tested this on the wire as well and no issues ?

As for the wifi. You will have latency it's just a matter of how much. Under normal conditions with moderate wifi use and no interference you can expect latency at about 20-75ms.

If you have high wifi use and or inference you can see this increase higher. In some cases 100+. D

Another thing is sleep mode. The device you are using to ping the gw with. Is this configured got sleep mode in anyway ?

So test the wired to rule that out. Then look at wifi use or interference.

Do you have any tools like a l2 analyzer or a spectrum analyzer ?

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Re: Wifi Latency

pbuch — Mon, 10 Dec 2012 14:34:38 GMT

I see exactly the same in my lab-setup. If i change the ap to Flexconnect, the latency is <1ms.

Have tryed with 7.3 ... but now on 7.2.111.3

Re: Wifi Latency

George Stefanick — Mon, 10 Dec 2012 15:12:45 GMT

Can you draw out what the topology looks like ?

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Re: Wifi Latency

pbuch — Mon, 10 Dec 2012 15:18:01 GMT

Easy

A SG300-10P 10-Port Gigabit PoE Managed Switch

A WLC2504 and a AIR-CAP2602I-E-K9

one small server (dhcp) an a couple of labtops, wired and wireless.

Have been trying with a AP1242AG altso .. same result.

Average ping is around 45ms and less than 1ms with Flexconnect.

Airquality is 100 🙂

Wifi Latency

George Stefanick — Mon, 10 Dec 2012 17:31:41 GMT

yea, something doesnt sound right. hard to say why you would be seeing latency. if you are saying you are connected in a lab like that and you are seeing latency one would think its happening at the wlc.

Wifi Latency

pbuch — Mon, 10 Dec 2012 17:35:37 GMT

45ms makes the wireless network nearly useless.

Wifi Latency

pbuch — Mon, 10 Dec 2012 17:42:11 GMT

With Flexconnect i can windows copy 1Gb in 2,5 min ... guess thats ok

Reportet connect at 300mbit/s

Wifi Latency

George Stefanick — Mon, 10 Dec 2012 17:42:36 GMT

Are you using super sensitive apps?

I have over 6,000 clients / 3,000 aps and work in a hospital with hundreds of applications. Most of which are used over wifi devices like CoW and handhelds. We expereince betwen 5 - 80 ms and arent having any issues.

Wifi Latency

George Stefanick — Mon, 10 Dec 2012 17:45:19 GMT

Lets be clear latency and bits per seconds are two different things. And 300 PHY rate doesnt mean 300 megs of throughput, rather it means you are sending 300 million bits per transmission.

Wifi Latency

pbuch — Mon, 10 Dec 2012 17:51:52 GMT

In "Local" mode .... windows reports 3 hours and 45 min for the same copy. Still connected at 300Mbit/s

Wifi Latency

George Stefanick — Mon, 10 Dec 2012 17:54:52 GMT

is that right ? Yea somethin is wrong for sure. Is your interface on the swicth and wlc configured properly ?

Wifi Latency

pbuch — Mon, 10 Dec 2012 17:55:12 GMT

Agree, but this is a one Client one AP one Controller one Server setup