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

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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
36 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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4answers
97 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, ...
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1answer
42 views

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
35 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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5answers
3k views

HP Envy dv6t-7300: Disabled WiFi through button and can't enable it anymore

Well, I have a HP Envy dv6t-7300 laptop that came with a Ralink RT5390 WiFi card. Everything was working perfectly, and eventually I press the WiFi button in my keyboard to toggle the card on/off. ...
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1answer
220 views

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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1answer
123 views

Unable to connect to Internet after wakeup from hibernate?

It says Networking is Disabled. I have tried checking that box (which stays checked); but that does nothing. Even tried: sudo ifconfig wlan0 up; which also did nothing. I'm running Ubuntu 13.10 x64.
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70 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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1answer
2k views

Losing ip addresses, during cable disconnects

I have two Ubuntu PCs whose network cards connected directly to each other with cross-over cable. I have assigned ip addresses manually to their interfaces using command similar to ifconfig eth0 ...
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1answer
32 views

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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14.04 won't see new network card

After installing 14.04 64 bit, if I add a new WIRED network card, the system will not see it. It is visible in lspci but it is not visible to linux. It will not show up in ifconfig. I have tried three ...
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1answer
47 views

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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1answer
33 views

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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1answer
46 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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2answers
3k 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 ...
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1answer
206 views

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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1answer
426 views

'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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3answers
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What is the difference between Network Manager and 'ifconfig' 'ifup', etc?

Ubuntu seems to provide at least two network "toolsets" (for lack of a better term). I'm running into conflicts between these two. Network Manager Something which is more like the traditional ...
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1answer
80 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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2answers
158 views

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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1answer
94 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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41 views

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 ...
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3answers
4k views

The command could not be located because '/sbin' is not included in the PATH environment variable

I have a severe problem today: when I type ifconfig it does not show ip configuration on ubuntu 12.04. Can anyone help me on this? Here is the result of ifconfig: Command 'ifconfig' is available in ...
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164 views

Only killing eth0 enables internet

I connect to wifi and ifconfig report 3 interfaces (lo, eth0 and wlan0), but I cannot ping anything, including the router. Only after ifconfig eth0 down I get to actually use the internet. What is ...
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2answers
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Why do i have to be root to run the command ifconfig?

I've recently switched from Ubuntu 10.04 LTS to 12.04 LTS, and one of the changes i have noticed is that when i try to run the command ifconfig (for example to view my own ip), i get the following ...
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1answer
185 views

ubuntu 1310 with two NICs: one with dynamic address and one with static address

I am running Ubuntu 13.10 on a laptop with one physical wired NIC (eth0) and one physical wireless NIC (wlan0. The current config is shown below (I removed lo interface since it is of no relevance) ...
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5answers
16k views

Ethernet connectivity problems after upgrading to Ubuntu 12.04LTS

I tried upgrading once more to 12.04 after it went live. I had tried both Beta 1 and Beta 2. The problem is that now I'm getting sporadic network connectivity. My computer is hooked up straight to ...
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52 views

network failing after RX errors

I am running 12.04.3. After a period (several hours to a couple of days) the network stops working. I can find nothing in any logs and my router is not recording errors, but I am getting RX errors ...
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205 views

How to dynamically switch public IP of my VPS (with multiple IPs)

I have VPS with 7 IPs, running Ubuntu 12.04. You can see output of my ifconfig command here at picture: if config output Now I want to run php script under the different public IP each time. For ...
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unable to connect to wireless on ubuntu 12.04

Some time back my system hung following which I rebooted it. Since then nm-applet does not list wireless network. It only shows wired networks. Rfkill list all shows only Bluetooth connection. ...
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315 views

Mininet problem in allocating IP address

I have encountered a problem in Mininet. The eth0 is allocated to NAT in Mininet and has a certain IP address to connect to the internet. But when I define a host only adaptor, the IPv4 is allocated ...
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1answer
380 views

Configuring a network interface and changing mac adress permanently

I need to configure a network interface permanently eth1 and to change the MAC address with the specified format : AA:BB:CC:DD:x:y, before the interface is up. A=1;B=2;C=2;D=2;x=6;y=8. I wrote in ...
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2answers
85 views

Identifying correct connection device when reading ifconfig output

I'm trying to get the mac address of my computer. I've run ifconfig like the person in this question, and I get information about eth0, eth1 and lo. The HWaddr of eth0 and eth1 are different, so I ...
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1answer
17k views

Is it possible to use Ifconfig to switch an interface to DHCP and if not, what is the best way?

I have just set up a new Ubuntu server and I am going to be doing a lot of networking tests. During setup, I simply skipped the network step. I now need to switch between DHCP and an address quite ...
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1answer
7k views

Connecting to internet after clean install of ubuntu server 12.04

I've installed ubuntu server on my computer. I would like to connect to the internet to download more software. I've done: ifconfig eth0 up so when I print ifconfig I can see the eth0 listed, but ...
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1answer
626 views

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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2answers
2k views

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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1answer
106 views

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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1answer
618 views

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
516 views

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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81 views

Failing to add second NIC for direct crossover connection to second server

We have two servers, now standing next to each other at our hoster. The have both a second NIC and are connected directly. I have added the new NIC via the following commands: Server 1 $ sudo ...
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1answer
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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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1answer
2k views

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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4answers
604 views

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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1answer
107 views

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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3answers
9k views

Is there a safe way to disable DHCP from command line?

Short version I know this question is very similar to others and I did really search the Internet for answers, but it seems that no approach is working or the solutions seem to be "to complicated to ...
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1answer
2k views

How to change wlan0's channel

When setting the channel to wlan0, I get an error: SET failed on device wlan0 ; Device or resource busy. I tried to shutdown wlan0 by: sudo ifconfig wlan0 down and wlan0 did not appear in the ...
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1answer
93 views

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 ...