Managing and using network connectivity on a Ubuntu system

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5
votes
7answers
20k views

WI-FI doesn't work (Hard Blocked) [duplicate]

Yesterday I installed Ubuntu 12.04 for the first time (I've always been a Windows user) as I was at the office and I had the Ethernet connected. At home I only use WI-FI. When I started Ubuntu it ...
3
votes
4answers
14k views

How do I get an iball 3.5G modem working on Ubuntu?

I purchased iball 3.5G connect wireless modem 1 month before. I am trying to connect it with my laptop which is having ubuntu Operating System. After plug-in it to the ubuntu system it is not ...
1
vote
2answers
5k views

Ubuntu 12.04 Realtek RTL8188E Wireless Card Not Detected

I have Ubuntu 12.04 (WUBI) on my Toshiba Satellite. I have a Realtek RTL8188E Wireless LAN 802.11n. The internet works fine when I plug it in using a ethernet cable, but my laptop doesn't even search ...
52
votes
11answers
173k views

List all MAC addresses and their associated IP addresses in my local network (LAN)

How can I list all MAC addresses and their associated IP addresses of the machines connected to my local network (LAN)?
30
votes
4answers
12k views

How can you monitor internet download usage?

Some broadband providers impose a monthly download limit, charging extra if you go over. It is also quite easy to exceed some of the lower limits just by installing/updating packages and 'normal' ...
43
votes
3answers
62k views

How can I see what ports are open on my machine?

I would like to see what ports are open on my machine, e.g. what ports my machine is listening on. E.g. port 80 if I have installed a web server, and so on. Is there any command for this?
24
votes
7answers
62k views

How to run “sudo apt-get update” through proxy in commandline?

In my office i want to update and download through (wget) and here they are using proxy? How can i do this by commandline?
8
votes
1answer
23k views

Connect Ubuntu to other PC with direct (crossover) cable

Ubuntu 11.04 (PC-1) is connected to PC-2 (Windows XP) with LAN cable (crossover direct cable) Internet access is through USB wireless modem accessing router in separate room If I boot in Windows 7 ...
4
votes
4answers
31k views

How do I get a Qualcomm Atheros Killer E2200 gigabit ethernet card working?

I bought a new computer, hoping to dual boot Win 8 and Ubuntu 13.04. I have successfully installed both OS, but in Ubuntu I have no connection to the internet, even though the ethernet cable is ...
15
votes
0answers
12k views

Command to know my external IP address? [duplicate]

How can I get my external IP address using the Command Line?
13
votes
5answers
12k views

Internet slow on Ubuntu but not windows using a RTL8111

I have just installed a dual boot windows7 /ubuntu 11.10 and the internet is much slower than windows. I have read the post here and tried the solutions presented and none have worked. Here is what I ...
17
votes
7answers
43k views

Restarted computer during update; “the system network service is not compatible with this version”

Yesterday I upgraded my Ubuntu by SSH but before I finished it, I restarted my computer. I know that was not very smart. Anyway now I don't have internet connection, the WiFi or Ethernet is not ...
10
votes
2answers
29k views

Network Manager Icon disappeared 14.04

So a couple of weeks ago my network manager icon stopped appearing; I still get automatically connected to my saved networks and the internet works fine, etc. If I go into System Settings and look at ...
5
votes
2answers
16k views

Wifi Not Working On Ubuntu 14.04 Lenovo G 50-30

I am facing problem to enable wifi on my Lenovo G50-30 Below are the command out put please help me out lspci | grep -i wireless: 02:00.0 Network controller: Realtek Semiconductor Co., Ltd. ...
3
votes
2answers
22k views

how to install Wifi and Bluetooth drivers in ubuntu 12.04 lts [duplicate]

I am using HP Pavilion 15 -no11tu which has been awarded the status of Enabled for Ubuntu. When Ubuntu was shipped with my hp laptop,Everything worked fine including WiFi,webcam and Bluetooth. Some ...
117
votes
11answers
170k views

How to display network traffic in terminal

how to display the actual network traffic (wireless) in a terminal? Additionally: Is it possible to add this info to the chart of top?
45
votes
6answers
175k views

How do I fix a “Wireless is disabled by hardware switch” error?

I just updated to Ubuntu 12.04 from 11.10 but soon after updating I was disappointed to see that Wireless is disabled by hardware switch. I can not click the button 'Enable wireless' which is ...
31
votes
3answers
9k views

How to run a script, depending on internet connection

I often mount a remote drive using sshfs. I would love to have this mount automatically. However, if I mount it in my .bashrc or startup scripts, the mount often fails because my wireless internet ...
11
votes
4answers
17k views

How do I SSH to machine A via B in one command?

I want to access a computer, say machine A which is based in my university's network. However, this computer is only accessible via the internal network of the university, so I can not use SSH to this ...
14
votes
2answers
5k views

How do I run Juju on a local server?

I'd like to use juju on my server at home to get to know juju and play with it. I have multiple computers and would like to access what's on the server from any of them. When I went through the ...
10
votes
1answer
20k views

Network indicator disappeared in Lubuntu [closed]

I just upgraded to Lubuntu 14.04 from 13.10 successufully, via do-release-upgrade. But after reboot, I found that the network indicator has been disappeared, so I cannot switch different network ...
14
votes
6answers
12k views

Ubuntu One behind a proxy, how to make it work?

I am behind a web proxy server at work (no authentication) and I have set it up in Gnome (configuration applied system-wide). It works fine for accessing internet with a browser, but numerous ...
5
votes
2answers
12k views

Broadcom BCM4401-B0 100Base-TX Issues

I installed Ubuntu 10.10 on my Dell Inspiron 1521 and the LAN/Ethernet card was working perfectly but Ubuntu was displaying a message about not installing the Wireless drivers because it was ...
12
votes
11answers
65k views

Wireless is disabled by hardware switch on Dell Inspiron 1750

I have a problem where Ubuntu (12.04) says there is a wireless network card, but it is disabled by a hardware switch. How do I turn it on? I checked the BIOS, and the wireless card is enabled there. ...
0
votes
1answer
405 views

Wifi is frequently disconnecting

The Wifi is frequently disconnecting in Ubuntu 15.04. My Wireless interface of Ubuntu is RT3290 Wireless 802.11n 1T/1R PCIe When wifi is disconnected, on iwconfig I got the following eth0 no ...
0
votes
1answer
4k views

Installing TP-Link TL-WDN4800 Adapter with Ath9k

I just bought a wireless adapter and am still trying to install its drivers onto Ubuntu. I have looked up ath9k and seen that it is compatible with kernal module ath9k. I'm new to ubuntu and most of ...
47
votes
13answers
59k views

How can I capture network traffic of a single process?

I would like to examine the network traffic being handled by a single process, but simple network captures won't work since I am dealing with such a busy system (lots of other traffic happening at the ...
63
votes
1answer
83k views

What is the loopback device and how do I use it?

What are loopback and localhost? Why do they exist, what are they used for, and how would I use them?
14
votes
3answers
58k views

KVM Bridged Network Not Working

I just installed KVM on my Ubuntu Server according to this guide : https://help.ubuntu.com/community/KVM/Installation Then prepared a bridged network as shown in here : ...
23
votes
5answers
56k views

How to network two Ubuntu computers using ethernet (without a router)?

How can I network two Ubuntu computers, so that they can "see" each other at an IP address?
17
votes
2answers
20k views

How to set up dual wired and wireless connections?

My laptop has both wireless and a wired connection capabilities. Can I connect to a router A using wireless and a separate router B using wired ethernet at the same time without having to switch back ...
13
votes
6answers
24k views

How do I stop my ethernet network connection from dropping?

My ethernet-based network connection doesn't stay up consistently. I'm running a ping against the gateway and it will: Work for a minute Freeze, time out, or give multi-second response times Repeat ...
8
votes
1answer
42k views

Can not access Internet (DNS names do not resolve) after update today

I have been using Precise for a few weeks now for work with no problem. Today, I am not able to access any website using either wired or wireless connections. I installed the updates today which ...
16
votes
3answers
25k views

How do I route my internet through a SSH tunnel?

Old Q How do I setup an OpenVPN server without root privileges? Is there a way to setup an OpenVPN server without root privileges? E.g. with configuration files in my home directory? If yes, how do I ...
7
votes
1answer
18k views

Installing the driver for TP-LINK TL-WN727N on Ubuntu 14.04

I am new to Ubuntu and I have problems with my Ubuntu 14.04. I plugged my wifi adapter but it did not work so I guess I need to install the driver manually but I don't know how to do it. I currently ...
6
votes
9answers
56k views

Wireless shows up as disabled, how can I get it working?

$ sudo iwconfig lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11bg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm ...
3
votes
3answers
12k views

How can I fix my WPA-EAP certificate problem?

I'm trying to connect my school's WiFi which has WPA-EAP. Everything else can connect to it except my ubuntu machine. I can connect on my HTC ONE X Android, OS X, Windows XP & 7, and iOS devices. ...
14
votes
3answers
17k views

How can I (from CLI) assign multiple IP addresses to one interface?

On my server I want to assign several IP addresses to one NIC, but without using the deprecated ifconfig or the obsolete "alias" notation (like eth0:0) in /etc/network/interfaces because in IP ...
6
votes
1answer
10k views

How do I connect to multiple wifi networks?

How can I connect to 2 WiFi networks at the same time with only 1 WiFi-adapter? I have two separate wireless networks, to which I need to connect the Ubuntu-PC simultaneously: The first with internet ...
5
votes
2answers
3k views

Is there any way to install Atheros e2400 drivers?

I have a new motherboard: MSI Z170A GAMING M5. This motherboard has an Atheros killer e2400 Ethernet controller. When I do lspci -nn, I get: 03.00.0 Ethernet controller [0200]: Qualcomm Atheros ...
5
votes
7answers
18k views

Internet very slow in Ubuntu

I have ubuntu 11.04 as the os, both surfing the net and downloading stuff is a pain, it is really slow. I have turned ipv6 off, my connection is properly configured, but still it is very slow. I ...
10
votes
5answers
14k views

Why does Skype suddenly fail to log in? Turns out, it's tor!

I am not sure if I'm looking at a network problem or a bug here. Since the update to 4.2.0.11 my Skype can't connect any more. My room-mate has the same problem. We're both on Ubuntu Raring Ringtail ...
9
votes
2answers
6k views

Connecting to VPN prevents access to normal web sites

I have Ubuntu 10.04 installed with OpenVPN, and when I connect to a VPN, http access to non VPN sites stops working, until I close the VPN connection. To be more specific, both Chrome and Firefox stop ...
4
votes
1answer
5k views

Use of Predictable Network Interface Names with alternate kernels

Almost constantly, I use kernels from the Ubuntu kernel PPA, or kernels I have compiled myself, using the Ubuntu kernel configuration. The problem is when I am using the stock kernel it seems to ...
1
vote
3answers
23k views

Is it possible to install Ubuntu through network?

I would like to install Ubuntu for almost 120 users. But it's very difficult in using USB and drives. please suggest ....
11
votes
2answers
14k views

How to disable/enable automatically connecting to WiFi?

Whenever I restart my WiFi router, Ubuntu tries to connect to my neighbours' WiFi networks. There's over 30 wireless networks in the area. Ubuntu prompts me for the password to all of those. This is ...
8
votes
4answers
2k views

How to reach a host in the same network by hostname?

I have a network which connects a couple of hosts. I would like to be able to reach other hosts from one of them using the hostname. I just discovered the ".local" domain, which is available through ...
4
votes
1answer
4k views

apt-get update stuck: Connecting to security.ubuntu.com

When I run apt-get update on my machine it gets stuck at: 100% [Connecting to security.ubuntu.com (2001:67c:1562::15)] [Connecting to archive.canonical.com (2001:67c:1360:8c01::16)] I have made no ...
4
votes
2answers
9k views

AR9285 Wifi on Lenovo z570 not enabled

Help please. Installed ubuntu 11.10 32bit on lenovo ideapad z570. When choosing Network Manager > Enable Wireless nothing happens. WiFi not enabling Tried the response of Wireless problems with ...
1
vote
2answers
8k views

atheros wireless ar9285 driver

I have been having problems with wireless on Ubuntu 10 and above, Mint 11 and above. The problem is in the driver for the wireless... I can see that there is no driver installed and yet it works but ...