a command from Linux POSIX operating system able to give information about the IP network.

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20
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2answers
6k views

ip versus ifconfig

After reading this answer, I began my quest for the difference between ip and ifconfig for *nix systems. I soon learned that ip had "more" features than ifconfig, but what's the real difference? Is ...
18
votes
2answers
13k views

Mac OS X: Please explain ifconfig output?

When I do ifconfig on my Mac, I get a list of the following interfaces: lo0 gif0 stf0 en0 fw0 en1 vmnet8 vmnet1 I wonder what each interface is. Also, which of these is the IP interface ? I don't ...
8
votes
2answers
12k views

How to see network traffic per interface in FreeBSD?

want to see an amount of traffic passed through interface since boot. It's an ISPManager VDS with FreeBSD 8.0, and ifconfig -L epair521b -B does nothing. Want to have output like Linux's ifconfig: ...
6
votes
2answers
13k views

Change IP address permanently with ifconfig in Debian

I know there are several tutorials on how to manually change IP settings. However, I have yet to find a solution that fits my needs. I need to be able to script something that changes the IP address ...
5
votes
1answer
8k views

How does Mac OSX prioritize network interfaces when routing?

To give a concrete example, how does OSX choose which of these default entries from netstat -nr to route to? Destination Gateway Flags Refs Use Netif Expire 0/1 ...
4
votes
5answers
4k views

What cross-platform command-line tool allows me to get my external IP address?

How do I get my external IP address from the Windows and Linux command line? On Windows, ipconfig shows an internal network IP address, but it does not show the external one.
4
votes
2answers
747 views

Is `ip` to supersede `ifconfig`

A friend of mine said that ip is supposed to be the successor of ifconfig and iwconfig — yet I found no Wikipedia article about it and have never seen anyone mention or recommend it online even though ...
4
votes
3answers
4k views

How to restore MAC address in Linux?

I have changed my MAC address in my Linux machine using ifconfig. Now the problem is I have not saved my original MAC address. I want to restore it without rebooting. Is there a way to do it?
3
votes
4answers
301 views

Three computers accessing internet but only two network interfaces showing in ´ifconfig´, why?

My gateway(router) is connected to DSL. The gateway connects to 1 wireless transceiver device. 2 fixed computers connect to the router. At the moment of me doing ifconfig 2 fixed computers were ...
3
votes
2answers
261 views

How to set txqueuelen on Mac OS X

How can I set the transmit queue length for a network interface on Mac OSX? On linux the command would be ifconfig en0 txqueuelen 5 but OSX doesn't recognize txqueuelen as a valid option. Where ...
3
votes
2answers
5k views

How do you change your Airport or Ethernet MAC address in Mac OS X 10.6?

I have a MacBook Pro and would like to set a custom MAC address for either my Airport WiFi card, or Ethernet port. In older versions of Mac OS X, you could do it like this: $ sudo ifconfig en0 ether ...
3
votes
1answer
102 views

VMware vmnet2 routes collide with en0

I am getting the following error when starting a vagrant box: gajus:vagrant gajus$ vagrant up Bringing machine 'default' up with 'vmware_fusion' provider... ==> default: Checking if box ...
3
votes
1answer
641 views

`ifconfig` isn't showing stats for an alx gigabit card

So I just setup conky on my arch box for monitoring various stats on the desktop, and I'm having a small problem. The relevant text in my conky config: down $alignr ${downspeedf enp9s0} kb/s - ...
2
votes
4answers
4k views

How to detect VPN disconnection with vpnc?

What is the easiest way to detect that a vpnc connection on Linux/Ubuntu has disconnected? Manually, I think the way to detect is to check whether the interface (tun0) appears in /sbin/ifconfig ...
2
votes
1answer
112 views

windows 7: assign static IP address [duplicate]

I want to connect two laptops with a crossover Ethernet cable, in order to synchronize them with ntp. One laptop runs Windows 7, the other one Ubuntu. On Ubuntu, in order to assign a static IP ...
2
votes
0answers
292 views

Script to join WPA2 Enterprise wifi

When I head to work with my MBP running OSX 10.7, I have to go through this series: Join Other Network Enter SSID select Security = WPA2 Enterprise generate a pw via my RSA soft token Join ...
1
vote
1answer
1k views

ifconfig - who decided that MAC address should be lowercase?

On some Linux computers, ifconfig displays the MAC address ("HWaddr") hex digits in uppercase. On other Linux computers, the [a-f] digits are lowercase. Why the difference? Are there two competing ...
1
vote
3answers
598 views

What is the real capacity of a network device (ethtool - MiB or MB?)

MiB = MebiByte = 1024*1024 MB = MegaByte = 1000*1000 ethtool returns speed = 1000MB/s ifconfig documentation indicated it returns units of MiB How can I tell from that ...
1
vote
1answer
621 views

What does the field `Memory` mean in `ifconfig`?

I find a field Memory in the result of ifconfig command. I am not quite clear about its meaning. By googling, I get some hint from unSpawn's post on this thread that Memory indicate what memory ...
1
vote
2answers
3k views

Trying to figure out route add to mask an IP to a router/gateway in Bash

Not even sure if I worded this correctly, but here’s what I’m trying to do roughly. Take an IP such as: 192.168.100.0 and mask it to 255.255.255.0, and set the gateway of that route to another IP ...
1
vote
1answer
56 views

Where is this IPv6 address coming from?

When I run ifconfig (after rebooting) on my FreeBSD 8.4 system it outputs this: inet6 fe80::225:90ff:fe10:7e84%em0 prefixlen 64 scopeid 0x5 inet6 xxxx:xxxx:1009::2 prefixlen 64 ...
1
vote
2answers
1k views

ppp0 strange default router address

I'm using 3G-modem to provide an Internet connection to my Linux box. So, when I issue ifconfig command, I see the following: ppp0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST> mtu 1500 ...
1
vote
1answer
2k views

How to set NIC in promiscuous mode on mac book air?

I am trying to run my nic on MacOSx at promiscuous mode and then use tshark / tcpdump Option1: ifconfig en0 promisc but I get this message: ifconfig: promisc: bad value Option 2: I tried sudo ...
1
vote
1answer
321 views

curl ifconfig.me and ifconfig showing different results

If I run curl ifconfig.me I get one IP, and if I run ifconfig, I get other IP's. Why is it so ?
1
vote
1answer
2k views

ifconfig ignores alias on IPv6

When I add an IPv4 address for the interface eth0:0 with ifconfig, it is created correctly: ifconfig eth0:0 add 192.168.10.10 This can be verified by ifconfig or "ip a". When I add an IPv6 address ...
1
vote
3answers
22k views

Spoof MAC address from IP command

I'm trying to spoof my MAC address on a modified version of Linux (Android). The main problem is that because it has been stripped down, the ifconfig command has been taken out, and I only can use the ...
1
vote
1answer
209 views

How to get current value of txqueuelen on Linux

I know the following command can set txqueuelen in Linux: ifconfig eth1 txqueuelen 4096 But how can I get current txqueuelen of a specific interface? I've tried ifconfig eth1 txqueuelen, it only ...
1
vote
1answer
3k views

How to run 'ifconfig wlan0 down/up' with a comm user?

I need to run ifconfig wlan0 down and ifconfig wlan0 up with my common user. How can I perform this?
1
vote
1answer
3k views

Install Ubuntu, eth0 not detected?

I have installed Ubuntu laptop Toshiba Satellite L640?, and I had difficulty, that is how to enable network interfaces, eth0 was not detected when running ifconfig.
1
vote
1answer
2k views

What does eth0:cp1 refer to in ifconfig on CentOS?

I have a basic ubuntu background and am not familiar with the output of an ifconfig on a CentOS server I'm looking at, can someone explain the eth0:cp1, and eth0:cp2 entries here? How are they ...
1
vote
2answers
3k views

Delete eth0 avahi from the ifconfig list

Hello this is the response I get from ifconfig. Now I have two eth0 things being showed up. I need to delete the second one which says eth0:avahi. I posted my ifconfig's response on a site as I has ...
1
vote
0answers
278 views

Why does “sudo ifconfig eth0 down” followed by “sudo ifconfig eth0 up” stop dhcp?

I am playing around in Ubuntu 12.04 trying to learn about networking. I learned that you can delete a network interface by running sudo ifconfig name_of_network_interface down However, when I do ...
1
vote
0answers
3k views

Ubuntu network keeps giving Network Disconnected - You are now offline message

On the face of it, you will find that this is a common question but please read it completely to understand the specific issue that I have. I am running Ubuntu 12.04.4. I keep getting this network ...
1
vote
2answers
360 views

Concise IP information in OS X Terminal

Is there a command for the OS X Terminal that shows you only the most vital IP configuration information about your machine? I know there is "ifconfig" but that brings up a bunch of (in most cases) ...
1
vote
1answer
162 views

EC2 instance with two internal IPs - using ifconfig

I am trying to allocate another internal IP to an EC2 (classic - not VPC) instance with the following command. sudo ifconfig eth0:0 inet 10.80.7.40 netmask 255.255.255.0 Here, 10.80.7.40 is just a ...
1
vote
2answers
931 views

ifupdown: interface does not get properly configured

Since some days ago, I'm suffering a traumatic problem with Debian Wheezy. Every time I boot the server, the only up interface is loopback. I have configured a static IP at /etc/network/interfaces ...
1
vote
1answer
3k views

How do I use a single wireless adapter for both an access point and client on raspberry pi?

I have been able to create a wireless access point (on my raspberry pi) using a usb wifi dongle using hostapd on wlan0. What I would like to be able to do is have the access point be on some virtual ...
1
vote
1answer
332 views

What causes a TX overrun, and how to troubleshoot?

On a Linux machine acting as a router I have a large number of TX 'overruns'. The machine routes through a tunnel interface (which is where the overruns are occuring). What would cause these ...
1
vote
1answer
326 views

ifconfig fails to install route if interface ip is existing broadcast address

Consider the following setup: X@Y:~$ sudo ip link add link eth0 name eth0.3 type vlan id 3 X@Y:~$ sudo ip link add link eth0 name eth0.2 type vlan id 2 X@Y:~$ sudo ifconfig eth0.2 192.168.2.1/30 ...
1
vote
1answer
202 views

how to force an illegal netmask in ubuntu

I want to force a netmask on my Ubuntu machine. For example, I want 11.0.0.1 to get a netmask of 255.255.255.0 I tried editing /etc/network/interfaces and I forced the desired netmask, but as soon as ...
1
vote
2answers
318 views

Ethernet and PPPoE conflict with each other

I have an old computer in my dorm room. It acts as a gateway and traffic-shaper (htb) for me and my roommates. Debian is installed into it. It has been working quite good for a year. Nothing ...
1
vote
1answer
693 views

Configure IP v6 on Linux machine

I use this command to assign a site-scope IP address: $ sudo ifconfig eth0 inet6 add fee3::216:cbff:fe94:1a86/64 $ Check it with ifconfig: $ ifconfig ... eth0 Link encap:Ethernet HWaddr ...
0
votes
3answers
80 views

What is the IP address of my home computer from the perspective of the outside world? [duplicate]

What is the IP address of my home computer from the perspective of the outside world? I need this in order to grant myself permissions to connect to a mysql database on a work server. I'm working on ...
0
votes
2answers
226 views

ifconfig command on mac does not show IP address

When I run ifconfig, eth0 is not shown, and only en0 is displayed: >> ifconfig en0 | grep inet inet 192.168.0.102 netmask 0xffffff00 broadcast 192.168.0.255 When I type My IP in Google, my IP ...
0
votes
1answer
480 views

Network conf - ever time must set ifconfig

I need to autoconfigure network. Network Manager is removed because I need lightweight system. After system starts networks doesn't work. #service networking status networking stop/waiting #service ...
0
votes
1answer
681 views

why do I get a different MAC address using arp and ifconfig?

# ifconfig eth1 Link encap:Ethernet HWaddr 00:1e:8c:10:xx:xx # arp Address HWtype HWaddress Flags Mask Iface 192.xxx.x.x ether ...
0
votes
2answers
896 views

Slackware cannot reconnect to local network

Hi guys this problem is frustrating me. After trying a lot of things to setup my wireless card, I decide to test it by shutting down LAN interface ifconfig eth0 down. Then, when I turn the LAN ...
0
votes
2answers
94 views

Linux: Any distro-independent way to change and persist IP settings?

Are there any distribution-independent mechanisms for tasks like assigning static IP addresses, adding or deleting routes, etc and, then, also be able to persist the changes so made? AFAIK, each ...
0
votes
2answers
5k views

How can I remove a network interface from being listed in Linux?

A software I use gets confused if there is irda0 (or some other uncommon device) in the ifconfig -a output. What is the easiest way of preventing that device from getting listed? I'm looking for an ...
0
votes
1answer
154 views

Run ifconfig without sudo

I have an embedded Linux running on a imx6 platform. This is a freescale embedded linux. The problem is that there is no sudo available for this linux, but I need to activate and deactivate the wlan0 ...