ifconfig (short for interface configuration) is a system administration utility

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no eth0 and no wired internet connection

yesterday all was fine and Dandy until the internet service went out due to a storm. After my isp got their stuff together all my other devices had internet except for my ubuntu desktop. I booted it ...
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21 views

ifconfig fixed ip address is lost after a while

I'm using ubuntu LTS14.04 and I want to make some lab experiments with two computers and a switch. Both computers are configured to start with DHCP but I want to assign two fixed ip addresses to each ...
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59 views

Network Interface does not come up automatically

I have a couple of Jetson TK1s and Jetson TX1s running Ubuntu 14.04 (Linux4Tegra). I need to be able to switch between two network configurations - an "office" one where I'm in the office and can ...
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2answers
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When using ifconfig to see my Mac address, which one is for connecting to a wireless network?

I am using an older laptop that I converted from windows xp to ubuntu 14.04, so my question is about what Hardware address should I use to connect to my college network? The reason I ask is because ...
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47 views

Ifup/ifdown problems in Ubuntu 14.04

I am condiguring my eth0 NIC connection through /etc/network/interfaces file. But each time I changed this file, I ran ifdown eth0 and it responded with waiting for lock on ifstate file and stuck ...
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Explaining the contents of the ifconfig command

Can anyone send me a hyperlink that explains what appears next to eth0 when the ifconfig command is typed into the terminal please? Thanks
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53 views

Ifconfig does not show my IP [closed]

When i'm putting the code on: ifconfig ifconfig results in a terminal shows: eth0 Link encap:Ethernet HWaddr: f8:a9:63:64:3f:1c UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets: 0 errors:0 ...
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34 views

How to configure two interfaces for internet and lan?

i have server which two int. and static ip. And i need one work in local network and another work to internet. How configure interfaces ?
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em1 needs to be manually started on boot

On every boot, I have to run the following commands to get my ethernet to function: sudo ifconfig em1 up sudo dhclient em1 sudo /etc/init.d/networking restart The ethernet adapter was working fine ...
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1answer
180 views

Two computer MAC Addresses

In Ubuntu 14.04, when I run the command ifconfig | grep HWaddr to know the mac address of my computer, I find two MAC addresses, how is it possible? zina@zina-HP-Pavilion-g4-Notebook-PC:~$ ifconfig | ...
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1answer
58 views

Connected but no internet access in Ubuntu 14.04

I have been using this broadband connection for a long time. Suddenly it stopped working, it shows "Connected DSL connection 1". But whenever I try to browse any website, it doesn't load and shows ...
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113 views

ifup eth0: unknown host

unfortunately, i am in Ubuntu Recovery Mode. I need Internet connection but, i fail to bring it up. $ ifconfig enp0s2 Link encap:Ethernet HWaddr xxxx inet addr: inet6 addr: ...
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No internet connection after reboot

I have an error on my debian server, hope you can help me anyway, because the systems aren't that different. I rebooted my vServer (Debian 8) and it doesn't came back up. Well, I used the rescue ...
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1answer
33 views

How to add multiple ips to ubuntu 12.04 server?

i hope that some can help me here. I have bought 6 additional IP:S and i need to run two gaming servers at same time for same game. So i need to add another ip so i can run these two servers at same ...
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1answer
69 views

Can not configure eth0 and eth1

I have two physical networks: eth0 192.168.0.0/24 with with several PCs and NAT adresss 192.168.0.1 where PPPoE connecting to inet; eth1 192.168.0.1/24 with several PCs and no internet. auto lo ...
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542 views

VirtualBox Ubuntu 14.04 - Bridge adapter not working

I'm having some troubles setting up my network connection using the Bridged Adapter configuration. I'm just starting with Linux and even if I was going through different forum discussions on the web, ...
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25 views

Is that right configuration?

I'm new to ubuntu and networking too i used ip addr to check the ip address and got 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default link/loopback ...
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28 views

How can I use multiple network connections from the same host?

Suppose I could use both a wired and wireless connection; now, let's say I want to run firefox using the wireless and steam using the wired, how can I achieve that? How can I plug them in? First ...
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694 views

Cannot configure eth0 in Ubuntu Server 15.10

My system just went a bit crazy past night. It was fully working, and nobody touched it. I configured a static public IP in my Ubuntu, and I could connect to it everywhere (My system accepts public ...
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1answer
52 views

Odd interface when running sudo ifconfig

So, I've noticed an odd looking interface... Apparently, it has it's own MAC address (which I don't even know where it came from... Attempting to perform an OUI lookup on it returns no results...) ...
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1answer
185 views

Find MAC address in the filesystem

My laptop is down, but I need to extract its MAC address thas was previously used to establish wifi connection. The filesystem was cloned, so I am trying to find any configurational file which ...
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20 views

upstart my.conf ifconfig changes seem to either have no effect, or get overwritten during startup

I have installed an upstart script like this: # This needs to go into the /etc/init/ folder description "Run MCP" start on runlevel [2345] stop on runlevel [016] console output script # ...
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165 views

ipv6 global address missing after link flap

in linux/ubuntu after the link flap on an interface the global ipv6 address is flushed out & not seen in ifconfig. Any kernel patch/sysctl to retain the ipv6 address configured after the ...
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1answer
64 views

usb Ethernet adapter disapear after Stoping network-manager service

I am using D-Link (DUB-E100) for handling 2 seperated network under linux ubuntu 14.04. at first i have 2 eth on my system . ifconfig yields: eth0 Link encap:Ethernet HWaddr b8:ae:ed:70:27:3e ...
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Use systemd to “mount” wlan0 at boot

Context (if needed) : at boot, the service "myservice" is launched. It manages to "up" the wlan0 interface. But it does not exist yet at boot. ifconfig, after boot, lists only eth0 and lo. If ...
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cannot ping localhost

I am not able to ping localhost ashish@ashishk:~$ ping localhost PING localhost (127.0.0.1) 56(84) bytes of data. ^C --- localhost ping statistics --- 16 packets transmitted, 0 ...
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Networking Issue, Binding on 14.04

IPs routed at the switch just fine. interface Vlan100 ip address xxx.xxx.235.1 255.255.255.0 secondary ip address xxx.xxx.236.1 255.255.255.0 secondary ip address xxx.xxx.237.1 255.255.255.0 ...
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60 views

Xubuntu Install-No Network

I installed Xubuntu 14.04 clean on a Dell Vostro 1000 and now I have no network at all. Entering ifconfig gets a return of ifconfig not found. Everything was fine from the live disk.
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wlan0 interface is missing

Whan I ran;: ifconfig eth0 Link encap:Ethernet HWaddr xxxxxxxxxxxxxxxxx inet addr:192.168.1.7 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: xxxxxxxxxxxxxxxxxxxxxx ...
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2answers
208 views

How to change priority interfaces

I have 3 network interfaces : lo, new0 and new1. I use the new1 to access the internet. My computer went nuts a few days ago and try to access the internet on lo. (localhost). When i ifconfig lo down ...
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1answer
124 views

Internet not working on Ubuntu 14.04.01 LTS

I am unable to connect to the internet from within Ubuntu (version 14.04.01 LTS). I've tried solutions in related forum posts, but none of them have worked so far. Any help to resolve this would be ...
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1answer
22 views

Problems turning off the wireless card

I am trying to turn off wireless using the ifconfig command ifconfig wlan0 down and nothing happens no errors displayed in the terminal and wireless networks are still displayed in the network ...
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703 views

How can I bring down this tun interface?

I can neither bring down nor delete this tun interface which is added on startup. Here's the output when I run ifconfig: eth0 Link encap:Ethernet HWaddr 50:b7:c3:92:38:e2 UP ...
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565 views

Script in /etc/network/if-up.d not executing when eth1 is on

I have a script in /etc/network/if-up.d . My intention is that script will execute automatically whenever my eth1 interface is up. But it is not happening. The script also have 755 permission level. ...
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56 views

Force a process to use a different network interface

If i have two separate connections. Let's say 3G on usb0 and wifi on wlan0. How can i easily ask for let's say transmission to download only with wlan0 and firefox to use usb0.
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iwconfig and ifconfig don't show wlan0, can't connect to wifi [duplicate]

iwconfig and ifconfig only list eth0 and lo. The network card is listed in lspci, however. How can I get my wifi back? Output from lspci -nn | grep 280: 02:00.0 Network controller [0280]: Realtek ...
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1answer
267 views

Even after removing vlan entry in /etc/network interfaces file, ifconfig is showing the intreface

I had set up a vlan in interfaces file. Later on, even after removing the entries and restarting network, the ifconfig command is displaying that interface. Even ifdown isnt taking it down. Ifdown ...
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1answer
606 views

scripts in if-up.d not executed when ppp connection is created

I have a simple script "test" in /etc/network/if-up.d directory. The script contains below commands. It creates a empty text file, whenever an interfaces changes state from down to up. #!/bin/bash ...
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1answer
288 views

ifconfig sets wrong broadcast until ran again

This issue is very confusing for me. ifconfig sets a different broadcast address than specified, until I run the same command again. I'm trying to change the eth0 interface: inet addr:172.23.5.1 ...
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Using Multiple IPs for the same interface for different application?

I want to do some IP aliasing, but I want my browser to use a different IP from the IP for BitTorrent. For example: I want the browser to use this IP for example 192.168.1.45 and BitTorrent to use ...
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1answer
260 views

What is the difference between “Cloned MAC address” in “Edit Connection” GUI and ifconfig command?

I found that there are at least two methods to assign a spoofed MAC address to my network connection: Assign a MAC address to a connection using "Edit connection" GUI in WiFi (or Ethernet) tab ...
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2answers
2k views

What's the difference between `ifconfig`, `interfaces`, `ifup` and `ifdown`? [duplicate]

I'm somewhat new to network interfaces and I'm confused with the difference between the 4 terms. I've seen the related question here: What is the difference between Network Manager and ...
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1answer
388 views

use of eth0 and wlan0

I have a simple Arduino HTTP Server and I want to browse this server from my Ubuntu. If I assign to Arduino an IP 192.168.0.9 and I connect the Arduino HTTP Server to my router (to any of the 4 ...
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1answer
121 views

Ubuntu Server , Installed Hdd into another computer and now have no internet connection

EDIT: NVRM I figured it out on my own.. I needed to edit a file and remove the Previous eth0 and then rename my eth1 to eth0. I would like to set a static IP adress though if anyone wants to help me ...
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1answer
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I could'nt use ethernet in windows so i installed Ubuntu14.04 but its same.i ran the commands results are below

tonycarter@tonycarter-Inspiron-3521:~$ ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK ...
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132 views

wlan0 is not permanently turned down by ifconfig

I am trying to turn off my wifi interface using the following ifconfig command: ifconfig wlan0 down My wifi disconnected for almost one second and then it comes back up again. what is the problem ...
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1answer
8k views

How to change internal IP address from DHCP to static?

I have a pc running Ubuntu server 14.04.1. The internet was set up using DHCP I believe. I want to keep the same IP and subnet I have now but just change it to static for the internal IP.
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static ip in NetworkManager but ifconfig does not show the ip (ubuntustudio 14.04)

i am running ubuntustudio 14.04. I have a development setup where my pc has 2 NICs one of which connects to the internet and acquires dhcp ip from the router, while the other (eth1) is used to ...
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2answers
441 views

Is there a better way to programatically get the networking parameters from Linux OS?

I am writing some scripts which need to programatically get a lot of networking parameters from Linux OS. For example, the names of all network interfaces, ip address, netmask, MAC address. For ...
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4answers
226 views

No Wireless Internet Connections Show Up!

Just got Ubuntu on another computer and I've never had this issue. On Windows Vista, (the operating system alongside Ubuntu) The internet works fine. But when I click on the icon in the top right, ...