136 votes

Why do WiFi routers do such a bad job of channel selection?

The failure of Wi-Fi APs to pick 2.4GHz channels well comes down to a small handful of issues: Most only pick a channel at boot time, but a channel that was good when the AP was last rebooted may ...
Spiff's user avatar
  • 104k
66 votes

Is hiding your Wi-Fi SSID without password secure?

NO. When you hide your SSID, it is broadcast by clients, so its easy enough to discover anyway (just Googling "discovering hidden SSID" will link you to multiple tools and ways this can be ...
davidgo's user avatar
  • 70.7k
52 votes

Why do WiFi routers do such a bad job of channel selection?

The overarching problem here is that the 2.4GHz band is completely saturated in any moderately populated area. In addition, there are only 14 channels, depending on country, available to use. Out of ...
Appleoddity's user avatar
  • 11.7k
39 votes

Windows 10 Wifi Sets Wrong DNS Server When Connecting to Wifi Networks

This is an older question but I just wanted to add my answer here because this question came up when I was searching for an answer and it pointed me in the right direction. If your nameservers point ...
4AM's user avatar
  • 580
32 votes

Is hiding your Wi-Fi SSID without password secure?

Hiding SSIDs is also bad for privacy. In addition to providing exactly zero security (as the other answers have explained), hiding the SSID is also a very bad idea if you care about privacy. In a &...
TooTea's user avatar
  • 621
28 votes
Accepted

Mystery WiFi network shows up when laptop is connected

Its related to screen casting - which uses miracast and wifi direct. The feature is called "Projecting to this PC" and found under "connect" in the action center . Its a new feature with windows 10 ...
Journeyman Geek's user avatar
  • 129k
20 votes
Accepted

Can a Windows 10 Machine that has both an Ethernet NIC and a Wi-Fi NIC get Internet via Wi-Fi, and Provide it to Another Device via Ethernet?

Yes, you absolutely can! IMHO, this used to be easier before Microsoft changed all of the settings applications but it can still be done. Open Windows Settings (click Windows Menu, click Settings ...
Señor CMasMas's user avatar
16 votes

Windows 10 Wi-Fi issue: "Can't connect to this network"

I had the below Windows 10 Wi-Fi issue: “Can't connect to this network” while every other wireless devices worked, this newly upgraded Windows 10 did not. The below helped: In Device Manager, right ...
ACMN02's user avatar
  • 161
16 votes

Wi-Fi opt-out Microsoft & Google

Google's _nomap must appear at the end of the SSID while the Windows _optout can be anywhere in the SSID, so this should work based on the docs below: SSID_optout_nomap https://privacy.microsoft.com/...
sadtank's user avatar
  • 299
14 votes

Windows 10 Wi-Fi issue: "Can't connect to this network"

Even after a reboot, I found "can't connect to this network" error. To resolve: open Device Manager (devmgmt.msc), locate the wireless network adapter, disable and then re-enable. Wireless connected ...
sonyisda1's user avatar
  • 297
13 votes
Accepted

Multiple access points / Switching issues

Set both access points to the same network name (SSID). Make sure both have the same network security settings, non-mixed, AES only, Same network keys, but on non-overlapping channels. Set the fist ...
Tim_Stewart's user avatar
  • 5,979
13 votes

Why do WiFi routers do such a bad job of channel selection?

Just adding a visual representation about the 2.4GHz congestion vs the 5GHz band to the already excellent answers. I live in an European capital with a strong Internet and Wifi market penetration. ...
Rui F Ribeiro's user avatar
12 votes

What happens if two networks have the same SSID and password?

Two identically named SSIDs with the same password will allow your device to connect to either, without having to add any extra networks on your devices. If both routers are broadcasting from the ...
Mark Riddell's user avatar
10 votes

How to get the MAC Address and signal strength of nearby wireless devices?

Well Everybody answered the Question for Windows Platform only. So, I thought It would be useful to answer for Linux Platform too. On Linux you can do the following: Getting MAC Address of Devices ...
C0deDaedalus's user avatar
  • 2,590
10 votes

Why do WiFi routers do such a bad job of channel selection?

As Spiff mentioned, channel selection is usually only done during boot time, as periodic re-evaluation of utilization of alternative channels requires additional or better hardware. There is also no ...
Klaws's user avatar
  • 312
10 votes
Accepted

Understanding the output of the 'iw reg get' command

Interesting question, and I didn't know the answer, so here is how I found out: The source code for 3.17 shows where the data comes from. In particular, The first group (5250 - 5330 @ 80) is the ...
dirkt's user avatar
  • 16.9k
8 votes
Accepted

Different ssid on the same channel

It's probably routing a guest and private network - this is fairly common. There is an impact, but this can be managed, and it's better for the router to use the same frequencies rather then ...
davidgo's user avatar
  • 70.7k
8 votes
Accepted

WiFi QR Code format for WPA2/WPA3

The format was originally invented, and documented, by the ZXing QR decoder. There is no value for WPA3 (or WPA2 for that matter) because the value T:WPA means any WPA version, not just WPA1 (although ...
u1686_grawity's user avatar
8 votes

Save wifi networks and passwords to recover them after reinstall OS

The WiFi passwords of saved networks can be acquired by running this command: sudo grep psk= /etc/NetworkManager/system-connections/* This will show you the list of the WiFi networks and their ...
harrymc's user avatar
  • 481k
7 votes

Windows 10 Wi-Fi issue: "Can't connect to this network"

Log into your router and change the network name. I have fixed this issue on multiple laptops by doing this. It seems to simple, and like this it should have no bearing on connectivity, but it does.
Roy's user avatar
  • 71
7 votes
Accepted

Sign-In to Network protocol

Direct quote from How Automatic Detection of Captive Portal works (follow link for full text) Basic strategy behind Captive Portal detection The Automatic Detection of Captive Portal mechanism is ...
guest's user avatar
  • 3,409
7 votes

Turning an old ADSL modem into a WIFI adaptor for PC?

It depends. This will only work if your "modem" (I assume you actually have a modem/router/WiFi-Combo) is WISP capable. If it is you can connect it to a regular WLAN AP. Be aware that this ...
Albin's user avatar
  • 10.6k
6 votes
Accepted

Why do I have such a low WiFi speed?

The fact of the matter is that you are getting about the best speeds you should be on an 802.11 network with the hardware you are using. While your router is capable of higher data rates using ...
YLearn's user avatar
  • 1,928
6 votes

Connecting to a 5 GHz Wi-Fi connection every time

You can specify what band your wireless card will connect to in the advanced driver settings found under your wireless card in device manager. If you don't want to connect to 2.4ghz disable the ...
6 votes

Why do WiFi routers do such a bad job of channel selection?

In a high-congestion area where there are dozens of APs on 2.4GHz channels 1, 6 and 11, I sometimes get a more reliable connection by forcing 802.11b (the slowest mode), especially on less-used ...
krubo's user avatar
  • 755
6 votes
Accepted

What does "lmui" mean?

L(ocal?) Management UI, most probably. The very interface you've configured this option through. Since it says "from wifi", you'll need to connect to your router via a wired interface to access it.
ivan_pozdeev's user avatar
  • 1,912
6 votes

How to know strength of wifi signal?

RSSI is the "Received Signal Strength Indicator", and it's given in units of "decibels relative to 1 milliwatt", which we abbreviate as "dBm". Decibels are a logarithmic ...
Spiff's user avatar
  • 104k
5 votes
Accepted

Why the trend to have SSID prefix start as "Direct-xx"?

It's because those devices are setup for WiFi-Direct. From a protocol point of view a Wi-Fi direct connection is established using already existing mechanisms in a number of steps: In a ...
5 votes

Missing Microsoft Hosted Network Virtual Adapter while setting up WiFi hotspot in Windows 10

I restored my old WiFi driver using the steps found here because my new one was breaking the hosted network functionality. To restore a driver to its previous version You must be logged on as ...
YehyaUmar's user avatar
5 votes

What happens if two networks have the same SSID and password?

The other answer here is technically correct on "it will allow your device to connect to either (if both of them are broadcasting from the same location)", but there is a subtle detail here ...
RayLuo's user avatar
  • 279

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