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

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how to find network active time?

How to know uptime ,downtime with timestamps of all connections of ifconfig. For my case they are three eth0,wlan0 and ppp0.
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The ifconfig command is not running [closed]

I am using Kali Linux through vmware . I tried to use ifconfig command. but it shows error message command doest exist. please give me a solution.
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ifconfig up for multiple interfaces

I want to execute "up" command for multiple interfaces and thought that using ifconfig eth{0..3} up would help, it doesn't, how can I achieve this ?
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Wired connection keeps disconnecting

The wired connection to a Netgear DS104 hub keeps disconnecting. It has never been able to maintain connection on this system. I have never run this hub on unix but it functions without issue on ...
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2answers
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Impossible to ping when activating second network card

I'm new to Linux, trying to get a Clonezilla server up. I'm really bad at understanding how my network should be configured. eth1 is the card for internet access, behind a proxy (192.168.41.5:80) eth2 ...
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How to reset ifconfig counters?

When i run ifconfig eth0 see following lines: eth0 Link encap:Ethernet HWaddr 08:00:27:42:81:a7 inet addr:10.0.2.15 Bcast:10.0.2.255 Mask:255.255.255.0 inet6 addr: ...
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Ignoring unknown interface wlan0=wlan0

So here's a weird one. My wireless works fine if I configure it manually, but fails miserably when I try and configure it in /etc/network/interfaces. I think I've tracked it down to ifup not ...
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How can I get unformatted ip address information in the shell?

I'm writing a shell script which needs information on the state of the network connection - the basic stuff like ip address, subnet, netmask and so on. I could just use ifconfig and sed/grep for the ...
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2 ethernet ports, one on 100mbps, one on 1000mbps problem?

I ran across a strange sight when I ran ifconfig first time today. I have a gigabit server card with 2 ports. I have it set in a bond for 802.3ad usage as my switch supports it. It appears though ...
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Ubuntu Server several network ip config?

I have one ubuntu server and i want config that with several IP address! is it possible or no? if yes how I can do that?
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How can I display eth0's IP address at the login screen on Precise Server?

The server I administrate, inconveniently enough, has a dynamic IP address assigned by DHCP. The convenient counterbalance, though, is that it happens to be set up about two feet from where I sit. I ...
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What is the active MAC Address of my computer?

While looking to find the MAC Address of my computer as it appears to a wireless network, it was recommended that I run ifconfig. Having executed that command in the Terminal, I noticed that, unlike ...
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How do I make the script to run automatically when tun0 interface up/down events?

I use VPN client to connect to my corporate servers. It creates tun0 interface after starting the client. I've written script which install specific routes point to tun0 interface and rest to use ...
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NetworkManager problem with 'cloned MAC address'

My problem is that at univ. each desktop computer is given a 'fake'/'cloned' MAC address which is recognised by our network and let us in without further authentication/VPN and the likes (don't ask ...
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How to define a secondary IP address that is down by default

I can define a secondary IP address on the same network card by adding the lines auto eth0:1 iface eth0:1 inet static address 192.168.9.101 ... to /etc/network/interfaces. This ...
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Add static ARP entries when network is brought up

I have some pretty dumb IP devices on a subnet with my Ubuntu server, and the server receives streaming data from each device. I have run into a problem in that when an ARP request is issued to the ...
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Inconsistent internet connection device (eth0 eth1 eth2)

I'm running Ubuntu 12.04, and to my knowledge there is only 1 networking card on my machine (Dell laptop) --- I can't imagine why there would be more than 1. Sometimes my internet connection runs ...
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What is the difference between “ifconfig interface down” and “rfkill block”?

I know rfkill block all will disable everything. But what about ifconfig interfaceX down? When I use it, it just drops the connection. And when I type ifconfig interfaceX up it reconnects to my old ...
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Connected wireless connection, but no wlan0. What's causing this?

I'm connecting (to the internet) over a wireless connection (as in, it's already connected), but there's no wlan0. Output produced by ifconfig: eth0 Link encap:Ethernet HWaddr 5c:ff:35:06:9c:b3 ...
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static ip address from XFCE GUI

I'm interested in the IOGear Universal Wi-Fi N Adapter as a wifi adapter. The fine manual states: Installation without WPS - Mac Step 1: Turn off your computer’s wireless connection (if applicable) ...
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Where are my wireless error logs?

When I type ifconfig it shows: eth1 Link encap:Ethernet HWaddr e4:d5:3d:70:81:b3 inet addr:192.168.0.6 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: ...
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Ubuntu-server first start

How do you change network settings? ifconfig gives ip 192.168.122.1 (I ping it and the Ethernet card works) I use sudo vi /etc/network/interfeces then after editing auto eth0 ifaces eth0 inet ...
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Question for class

I have a question for class that I cannot figure out, I was hoping the helpful folks at Ask Ubuntu could help. The question is basically this: Your Linux system appears to have a DHCP problem. You ...
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Changing internal home network ip address for connected devices

I have a few computers at home. For each of the computers, I can see the internal home network ip address on any given device by typing in ifconfig in the terminal. If the device is connected to ...
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What does interrupt in eth0 mean?

I wonder if "Interrupt" affects internet connection. eth0 Link encap:Ethernet HWaddr 60:eb:69:6c:55:83 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 ...
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How to allow a “standard user” (no sudo) make IP config changes without requiring admin password

Anyone know if it is possible to have a "Standard User" account make IP changes (via GUI or terminal) without requiring the admin (sudo) password? I want the user to be able to change interface from ...
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Identify Wireless MAC Address

I have a desktop for which I am using an Asus N-10 USB Wireless Adapter. No driver software is needed I guess since I can see the available wifi networks. However, I am unable to connect as the "MAC ...
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How can I make sure my server is connecting through my router?

I have a Ubuntu server with PHP, Apache2 and all of that setup and working on my LAN. Meaning from any computer connected to the same router I can connect to 10.0.0.3 (My server). I have setup my ...
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device shows up in lsusb + adb but not in ifconfig

I'm running Ubuntu in the VMWare Player under Windows 7: root@ubuntu:/# uname -a Linux ubuntu 3.0.0-17-generic #30-Ubuntu SMP Thu Mar 8 17:34:21 UTC 2012 i686 \ i686 i386 GNU/Linux I'm trying to ...
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Ifconfig bandwidth tracking

I've been using ubuntu servers for a long time, but something i've never quite understood was the ifconfig command and total bandwidth. I've found that on every server i've used, and some desktop ...
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OpenVPN bridge client on Ubuntu 11.10 doesn't work [closed]

I'm trying to set up my desktop running Ubuntu 11.10 to connect to my OpenVPN server in bridge mode. I have my client configuration file set up like so: remote [omitted] 1194 client dev tap0 proto ...
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How to restore ethernet connection?

I've had some issues with installing Lazarus in 10.04. After I finally installed it with aptitude, while running it prompted whole bunch of errors. Finally my PC was suspended and I had to reset it. ...
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Likewise 6.1 breaks network on Ubuntu 10.04.3

I'm trying to use PowerBroker LikeWise 6.1 on Ubuntu LTS 10.04.3 to join to my AD domain. I've done this in the past before LikeWise was owned by PowerBroker & I can get it to work "pretty well". ...
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I'm having trouble connecting to a wireless network, and the hardware switch is on, [closed]

So, just recently my computer has not been connecting to the internet. It had been working before but it just went off one day in the middle of use. I've gone into the network setting and made sure ...
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How do the ifconfig settings work?

I have $ ifconfig eth0 Link encap:Ethernet HWaddr 00:1f:d0:99:ea:a9 inet addr:192.168.1.130 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: ...
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ethernet disconnected, shows up in ifconfig

I am running 11.04, no remix. After installation, I could use wireless networks, but not ethernet. When I click on the connections menu item, it says Wired Network disconnected How do I fix this? ...
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Command line ifconfig problems - Not detecting all NICs

I am in the command line of Ubuntu server edition 10.04 and I have 3 Nic cards installed. When I type ifconfig it only detects one: Eth0. I tried doing sudo apt-get update, this did not work. Any ...
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How to configure my VirtualBox's Ubuntu IP?

I can't ping my Ubuntu on VirtualBox (within another Ubuntu). I had set my ip using: # ifconfig eth0 192.168.0.2 netmask 255.255.255.0 up but the ping still fails. What's different when you're in ...
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eth0 not working on startup

This might sound strange but, working with my Lubuntu 10.04 i've experienced troubles when connecting to my eth0 newtwork. After some googling, i've found out that by writting in the CLI the following ...