Managing and using network connectivity on a Ubuntu system

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51
votes
3answers
85k 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?
18
votes
7answers
58k 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 ...
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?
7
votes
3answers
102k views

How to turn on Network Discovery and Share between computers with Samba

I have an Ubuntu server. Accessing the server from Windows clients works fine. But the server is not listed among the available PCs on Windows client's Network overview. For windows machines it ...
5
votes
2answers
13k 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 ...
5
votes
2answers
28k views

How to set up a broadband connection

I have a bsnl broadband connection. I don't see any settings for broadband in Ubuntu, and I can't just connect automatically -- "wired connections" shows no connection. I see an option for mobile ...
2
votes
2answers
9k views

Unable to connect wifi ubuntu 14.04 LTS HP Pavilion Network driver rtl8723be

I have purchased a new HP Pavilion 15-ab030TX, just installed dual boot Ubuntu 14.04 next to Win8. But my wifi has been showing either very weak signal at times or none at all. I tried multiple ...
3
votes
1answer
3k views

No Wifi in Qualcom Atheros - Ubuntu 16.04 - Acer Aspire E 15

After Installing Ubuntu 16.04 in Acer laptop with Qualcom Atheros , it does not work. I tried , sudo rfkill list all 0: hci0: Bluetooth Soft blocked: no Hard blocked: no 1: acer-wireless: ...
5
votes
2answers
18k views

In Ubuntu, Is there an application like “Huawei Mobile Partner” for Broadband Connections?

I want to know that is there an application in Ubuntu which is like Huawei Mobile Partner. That application should provide: Display bandwidth SMS facility. Make Connection and ...
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 ...
0
votes
1answer
581 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 ...
136
votes
12answers
220k 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?
48
votes
6answers
194k 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 ...
32
votes
4answers
12k 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 ...
22
votes
1answer
35k views

Where to set proxy ignore list?

I upgraded to ubuntu 11.10 from 11.04, shocked to see few things... My system is behind a proxy, so I did set a proxy setting. Being a web developer, I want to remove a lot of addresses that I type ...
21
votes
5answers
24k 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 ...
29
votes
7answers
78k 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?
24
votes
4answers
24k views

How do you configure desktop for a static IP address?

By default Ubuntu uses DHCP and Gnome NetworkManger to configure interfaces. This is not optimal in many cases. How to configure a desktop machine for a static IP address that applies to all users? ...
20
votes
2answers
22k 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 ...
16
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 ...
5
votes
4answers
33k 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 ...
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 ...
8
votes
2answers
8k views

How do I join a Windows Active Directory?

We have a "mix-mode" Lab. and we want to migrate to Ubuntu, from Windows. In this process, how do we add Ubuntu workstations to a Windows Domain / Active Directory ('AD') setup?
7
votes
3answers
8k 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 ...
4
votes
1answer
12k 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 ...
7
votes
2answers
27k views

How to rename an Ethernet interface?

As my built-in NIC was not supported by Ubuntu out-of-the-box I was forced to use a USB NIC for temporary installation-time Internet connection. And the USB NIC has taken the eth0 name making the ...
8
votes
1answer
27k views

How to make X.org listen to remote connections on port 6000?

This is on Ubuntu 10.10 (Maverick Meerkat) 64-bit desktop. I want to make my X server listen to remote connections from clients in other machines on the local network. I know about ssh -X and that is ...
1
vote
1answer
856 views

Can't connect to wireless 13.10

I have ubuntu installed as the sole OS on a T420. Before this I had installed the #! distro (and Xubuntu before that) and wireless worked seamlessly on either. My home hotspot shows up but when I ...
73
votes
1answer
103k 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?
22
votes
2answers
152k views

Assigning a static IP to Ubuntu Server 14.04 LTS

I've installed Ubuntu 14.04 LTS Server in my machine on a separate hard drive while having my Windows 7 installation. The Windows OS has its full network connectivity and internet access through the ...
10
votes
3answers
27k views

How to merge multiple Internet connections into one?

My PC has a total of 4 NICs, 2 wired Gigabit Ethernet network cards and also 2 wireless network cards. (One Broadcom with proprietary drivers and Ralink with open source software, which works much ...
9
votes
1answer
28k 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 ...
8
votes
1answer
44k 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 ...
17
votes
3answers
28k 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 ...
3
votes
2answers
9k views

My Wifi drops the connection after a few minutes realtek8723be

After install Ubuntu 14.04 LTS ... everything works fine withouth doing update ... after few minutes my wifi drops wireless conn .. I must to reboot for using it again. My Network controller: ...
13
votes
5answers
13k 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 ...
8
votes
2answers
13k 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 ...
7
votes
1answer
4k views

Network manager issue: The system network services are not compatible with this version [duplicate]

I have seen relevant solutions in askubuntu and other sites but none worked for me so far. I reinstalled network manager, modem manager, tried to upgrade them and manually install everything, also ...
5
votes
7answers
19k 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 ...
3
votes
3answers
28k 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. Any suggestions?
5
votes
2answers
8k 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 ...
3
votes
1answer
413 views

Low wifi signal in 14.04 LTS

I installed Ubuntu yesterday, so I'm trying to get used to it. I'm really close to my router, but my wifi signal gets too low. Sometimes I'm in Facebook or Youtube and the signal is high, almost full,...
3
votes
4answers
15k 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 ...
3
votes
2answers
5k views

Rtl8187 wireless card drops signal within seconds

My Realtek RTL8187 USB wifi card is having trouble keeping a connection for more than a few seconds, while on the same machine under Windows 7 it has no problem. When I make the connection, I have a ...
2
votes
0answers
11k views

How to enable file sharing between two PCs?

How to enable file sharing between two Ubuntu Oneiric PCs. I have installed Samba both machines I have changed permissions to all create guest accounts file is in home folder Why cant I see shared ...
0
votes
1answer
139 views

Running Ubuntu in VirtualBox and it won't detect a public WiFi network

I have a Macbook running Mac OS X, and I have Ubuntu running in VirtualBox. I am using a public WiFi network on my Macbook, but for some reason my Ubuntu virtual machine won't detect it. It was able ...
0
votes
1answer
5k 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 ...
-1
votes
1answer
1k views

Able to access web by ip, but not by dns name

I'd like to post a solution to a problem I've encountered in my university. The issue is closely related to this post. I asked the user whether or not he found a solution but he never responded. In ...
53
votes
13answers
69k 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 ...
30
votes
5answers
106k views

How to find all the used IP addresses on a network

In my work there is a lot of computer and I want make a joke. I can close computer over the network but finding IP addresses is hard to me. How can I easily find all online IP adresses from 192.168.1....