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

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19
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2answers
5k 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 ...
10
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2answers
7k 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 ...
4
votes
2answers
6k 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: ...
4
votes
2answers
5k views

change IP address permanently with ifconfig in debian

I know there are several tutorials on how to manually change IP settings manually, however I have yet to find a solution that fits my needs. I need to be able to script something that changes the IP ...
4
votes
2answers
592 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 ...
3
votes
5answers
3k 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.
3
votes
4answers
248 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
191 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
337 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
3answers
2k 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
3answers
3k 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?
2
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0answers
226 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
446 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
332 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
4k 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 ...
1
vote
1answer
233 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
3answers
15k 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
321 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
605 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
2k 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
1k 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
63 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
0answers
60 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
242 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
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0answers
190 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
256 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
139 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
245 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
541 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 ...
1
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2answers
2k 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 ...
0
votes
2answers
31 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
224 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
2answers
853 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 ifconfig eth0 down. Then because the wireless does not work I ...
0
votes
2answers
76 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
1answer
512 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
1answer
401 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 ...
0
votes
1answer
12 views

ifconfig, ethernet device name too long and get truncated, how do I know the actual name?

I'm trying openSUSE 13.1 x86, but immediately encounter an annoying problem. In this openSUSE version, compared to 12.2, ifconfig does not show network device name as eth0, eth1 etc, but use a ...
0
votes
2answers
98 views

Enabling eth0 or eth1 for internal network in computer without internet access

I am installing virtual box in computer without internet access. I am not sure this computer has network adapter (Ethernet) or not. I have two virtual machine which can communicate each other (I ...
0
votes
2answers
66 views

Check NIC is connected to a router

I have access to a remote machine which has two network interfaces, eth0 is connected to same network I am in, so I am able to connect to it. But I need to test some usecases on eth1 but I am not sure ...
0
votes
1answer
828 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 ...
0
votes
1answer
2k 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.
0
votes
1answer
589 views

Easy persistent network config on ubuntu server

I'm having some problems configuring a static IP on my ubuntu server. What is the easiest way to configure IP, netmask, nameserver and default gateway on eth0? I've tried modifying the ...
0
votes
2answers
2k views

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

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 ...
0
votes
2answers
2k views

Assigning static IP address to Debian machine?

I don't know how to use a static IP address on a Debian machine. Can anyone help? I have the static IP address 83.222.248.100. This is what I've tried: $ cp /etc/network/interfaces ...
0
votes
1answer
874 views

What layer does ifconfig operate at?

What layer does ifconfig operate at when setting a MTU. Does it set the MTU for the physical device (Network Interface Layer) or the MTU of the packet (Internet Layer)? By executing ifconfig eth0 ...
0
votes
1answer
6k views

ifconfig return “unknown interface: no such device”

I'm trying to install a Linux driver for my wireless network card (D-Link DWL-G510) on my Red Hat Linux 7.1 machine with a 2.4.37.9 kernel. I downloaded the serial monkey driver from the sourceforge ...
0
votes
0answers
139 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 ...
0
votes
1answer
58 views

CE interface in Solaris 10 drops mac address (per ifconfig)

I recently installed Solaris 10 1/13 and proprietary TCP PEP software on a new hard drive within an old Sun v210. When the PEP software starts, the Sun's CE0 interface loses its "ether" address, ...
0
votes
1answer
799 views

how to test a VLAN set up under OS X Mavericks

I tried to set up an "internal" VLAN, with my mac (running Mavericks) routing this segregated traffic to one of the hardware interfaces. I think this should work irrespective of how people connect to ...