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wireless interview questions

Top 15 wireless interview questions


How can I adjust the preferred WiFi order? [duplicate]

This question already has an answer here:

I am using 13.04 Ubuntu. I want to make order on multiple wireless access.

Is there any way to do this?


Source: (StackOverflow)

How to set up Ubuntu as wireless accesspoint?

How can I set up my WiFi to be used as wireless access point on Ubuntu Server?

I have a local Ubuntu Server, it has a wireless card in it (802.11a/b/g/n) and I really want to set it up as an 802.11n access point since my normal access point does not support N.

It needs to work as a switch as well so I can connect and get DHPC through.

Edit: I don't see Network Manager as a good solution since it depends on a lot of X11 packages, and i don't want that on a server.


Source: (StackOverflow)

How to set wifi driver settings to prefer 5 GHz channel above 2.4 GHz

Currently I'm in a new building of my university. In this building my wifi often breaks down and then restores connection again. This is really irritating since it happens a lot.

Now as a coincidence there were some tech guys running around here and where asking everyone if the wifi was doing fine. I told them that my wifi tears down all the time and then reconnects. They figured out that my wifi is switching all the time between the 2.4 GHz channel and 5 GHz channel. They asked me if I could acces the driver settings of my wireless card. Unfortunately I don't know how to do this is in either Linux or Windows. And unfortunately again they only knew the windows solution xD.

So I hope somebody can tell me how I tell my wifi that it should stay on the 5 GHz network and not disconnect and switch to the 2.4 GHz channel?

-edit-

@arhimed, firstly thank you for your help.

I just tried what you said. It is some what different for me. I can't seem to save the settings when I change the setting and choose to use only the 5 GHz band.

"Network connections"->"Select the appropriate wireless network and click edit"->"In the wireless tab"->"Change the mode from infrastructure to ad-hoc"->"Choose 5 GHz band"

Wireless connection settings panel

However when I want to change the mode from infrastructure to ad-hoc the "save" button tells me that I have to authenticate myself. However I get no pop-up asking me for a password. Using sudo gnome-control-center didn't help either. I could still not save it. Also a error occured then in the terminal:

** (nm-connection-editor:5577): WARNING **: Invalid setting Wireless Security: Security not compatible with Ad-Hoc mode

Hopefully this is some usefull info for you to help me further.

--edit 2012/09/07-- Still no answer... Anyone?


Source: (StackOverflow)

Create WiFi hotspot on ubuntu

Although many questions have already been asked regarding WiFi hotspot, I didn't get any of the solutions working for me.

I connect to the Internet using a 3G Dongle of Huawei 3772 (Vodafone). The connection type is Mobile Broadband connection. I have to share this Internet connection with my other devices like mobile phones and laptops.

How can I create a WiFi hotspot connection for this connection.

I am using Ubuntu 12.04 LTS.

I would like to note that I have already tried some help links from Ubuntu but, they are so confusing that I could not understand them.


Source: (StackOverflow)

How to share a wired Internet connection with an Android phone (reverse-tethering)?

I have been trying to share my wired Internet connection with my Android phone. However I could not succeed in doing this. Has anyone of you ever succeeded? Operating systems that I use are as follows:

  • Ubuntu 10.10
  • Android 2.3

Source: (StackOverflow)

How to stop constantly blinking Wifi LED?

I have a Dell E6510 and after installing Ubuntu and connecting to a wireless network, my Wifi LED keeps blinking all the time, probably in response to traffic.

This is really annoying because it keeps drawing my attention away from the screen. Is there any way to turn this functionality off and just let the wifi light stay on all the time as long as it has a wifi connection?

Here is my lspci for the wifi:

Network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)

Source: (StackOverflow)

How can I check the information of currently installed WiFi drivers?

When I clicked on additional drivers on Ubuntu 12.04, I could not see any drivers.. How can I check what drivers are installed for WiFi on Ubuntu environment.


Source: (StackOverflow)

How to share a wired internet connection via Wifi?

Can someone please help me with a complete step by step guide to share my internet connection (which is through a USB modem by ZTE) with my iphone 3G?


Source: (StackOverflow)

My WiFi adapter is not working at all, how to troubleshoot?

On this site I see hundreds if not a thousand questions being asked about issues with a Wireless LAN adapter not being detected/recognized by Ubuntu. Some mainstream adapters appear to be utterly broken in Linux support, while others just require some simple steps to get it to work.

The options to get it to work appear to be infinitely huge and I have no clue where to get started!

What is considered 'best practice'? What order of things to try is most efficient in terms of time, effort and imposes minimal risk to my Ubuntu installation? Please help me save time and guide me what to do, step by step.


Source: (StackOverflow)

"Starting Wireless Hotspot..." but nothing happens

I was trying to create an WiFi hotspot for my android device. I used ap-hotspot to do so.

I configured the ap-hotspot using

sudo ap-hotspot configure

Then I started ap-hotspot using

sudo ap-hotspot start

Then it shows this

Starting Wireless Hotspot...

And then nothing happens, no further message is displayed, hotspot is not created.

What is Wrong? How to fix it?


Source: (StackOverflow)

How to disable built-in wifi and use only USB wifi card?

The built-in wifi card in my laptop (Dell XPS M1330) is crap, pretty much. I have an Asus USB wifi card which is significantly better, and it works fine. What I'd like to do is disable the built-in wifi card. Is there a way to do this (without having to boot into BIOS each time I want to disable/enable the built-in wireless)?

@mikewhatever: Here are those outputs

matt@sbod:~$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0b05:179d ASUSTek Computer, Inc. 
Bus 002 Device 004: ID 05a9:2640 OmniVision Technologies, Inc. OV2640 Webcam
Bus 007 Device 002: ID 0483:2016 SGS Thomson Microelectronics Fingerprint Reader
matt@sbod:~$ lspci -nnk | grep -iA2 net
09:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express [14e4:1713] (rev 02)
    Subsystem: Dell XPS M1330 [1028:0209]
    Kernel driver in use: tg3
--
0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g LP-PHY [14e4:4315] (rev 01)
    Subsystem: Dell Wireless 1395 WLAN Mini-Card [1028:000b]
    Kernel driver in use: wl

Source: (StackOverflow)

A tool to measure signal strength of wireless

I want to know if there exists any command line option or GUI tool (Ubuntu 11.10) so that I can measure the strength of wireless signal at a given location. I have a house where the wireless is not easily accessible at all corners I want to know at which corners or rooms the signal is weak.


Source: (StackOverflow)

Network manager forgets wireless password after sleeping or powering off

Every time I restore my computer from sleep or turn it on a window pops up asking for my wireless password. Once I enter it it connects successfully, but this happens every time. I'm using Ubuntu 11.10 with all updates installed. Shouldn't the password be remembered so you don't have to enter it every time I get on?

Anyone know why this is happening and how to fix it?


Source: (StackOverflow)

Wifi doesn't work after suspend after 16.04 upgrade

This particular version of the "doesn't work after suspend" came after upgrading to 16.04. It seems that the upgrade includes a Wicd applet (added to Metacity Classic Gnome task bar alongside regular network icon), but doesn't seem to work after a suspend. A sudo service network-manager restart duplicates this problem. It takes a complete reboot to get Wifi going again. Any ideas why?


Source: (StackOverflow)

How can I get Broadcom BCM4311 Wireless working? [duplicate]

This question already has an answer here:

Wireless was worked perfectly in ubuntu 10.10. Now I upgraded it to ubuntu 11.04. After this upgrade wireless is not working in my laptop, even "wireless connection" is not showing in network connection list.

What I have to do for this?

lspci output:

06:00.0 Network controller: Broadcom Corporation BCM4311 802.11b/g WLAN (rev 01)

Source: (StackOverflow)