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

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How do I get reputation on http://askubuntu.com/ [migrated]

How do I get reputation on http://askubuntu.com/ I would like help please
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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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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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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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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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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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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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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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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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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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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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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
105 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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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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It is impossible to bring down tun interface

I cannot either bring down or delete a tun interface which is added on startup. Here's the output when I type ifconfig: eth0 Link encap:Ethernet HWaddr 50:b7:c3:92:38:e2 UP ...
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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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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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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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380 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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175 views

ifconfig sets wrong broadcast until ran again

This issue is very confusing for me. ifconfig sets a different broadcast address then 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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How cleanup configuration of network interface without ifdown

I'm trying to develop a wifi remote configurator. Now I'm fighting with ifdown command. This command work good if you use the right "sequence": ifup wlan0=wlan0-HomeWiFi ifdown wlan0 but when I ...
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no inet 6 address-sftp and ftp not working and no eth1 showing on ifconfig.

I am trying to transfer files between a ubuntu 12.04 server and a 12.04 desktop using sftp. it told me that the connection had been reset by peer(port 22) and doesn't work. However, the ftp doesn't ...
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129 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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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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270 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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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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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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112 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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7k 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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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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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, ...
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eth0 NO-CARRIER, ifconfig shows no IP address

I left Ubuntu and came back after a while so I don't remember much. Now I'm trying to get my IP address. All I'm getting from running ifconfig is eth0 Link encap:Ethernet HWaddr ...
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821 views

I don't have permission to access this device on iftop and need to be root to run NetHogs

I have two dilemma's here: One is, I tried using iftop but it said I don't have permission to capture on that device (socket: operation not permitted) I can use ifconfig just fine. Also, I installed ...
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Get all binded ip addresses

I have configured my network card eth0 to use 3 IPs, such as 192.168.1.10, 10.0.0.10 and 192.168.0.10. After network restart, ifconfig is showing only one IP ie, 192.168.1.10. But I can ping ...
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Hardcoded static IP assignment for eth1

I'm setting up a NAT, and need to assign a static IP to my eth1 interface. The problem is that once in a while, it resets, and I need to run the following command again: sudo ifconfig eth1 ...
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Where are the settings for 'iwconfig' stored?

I'm going to be fiddling around with my wireless card's settings by using iwconfig. Before doing this, I would like to back up my current settings in case anything goes horribly wrong. Where are the ...
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221 views

ifconfig weirdly returns exit code 1

I am executing the following command to find the MAC Address of eth0 ifconfig eth0 | grep -o -E '([[:xdigit:]]{1,2}:){5}[[:xdigit:]]{1,2}' I have a java wrapper which just calls the script ...
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'ifconfig wlan0 down' doesn't work. I can't turn off wireless

I am trying to turn off wireless and since the Wicd button 'Switch off Wi-Fi' doesn't work I am forced to use the ifconfig command, I type sudo ifconfig wlan0 down and nothing happens. I ran it months ...
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Bonding interfaces not working

Everytime I put in the following code (below). The problem is that network devices become unmanaged. I set the managed to true. That didn't work. when I do the ifconfig it is missing the "bond0" ip ...
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Missing manpage for `ifconfig`

$ man ifconfig No manual entry for ifconfig See 'man 7 undocumented' for help when manual pages are not available. $ dpkg -l | grep -i manpages ii manpages 3.54-1ubuntu1 ...
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855 views

IP address changes in vmware?

I am using Ubuntu 13.10 in vmware on my Windows PC. So the problem is: when I see my IP using ifconfig command then it shows 198.168.33.180, but when I see my IP on whatismyip.com (on Ubuntu), it ...
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262 views

Wireless internet connection problem

I have a problem connecting to the internet using Ubuntu 12.04 I'm trying to connect to my home router/ap using my Lenovo T530 . Every other device works just fine on the WiFi. Also, my T530 works ...
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Cannot acquire DHCP address

I am unable to acquire a wired DHCP ip address. I have Ubuntu 13.10 installed on a thin mini-itx ECS Q77H2-TI motherboard. I'm connecting to my cable modem which does provide ip addresses to other ...