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ifconfig command

Q. How do I set / change the speed ( duplex settings ) on my FreeBSD network card? I'd like to change default 10Mbps to 100Mbps or vice versa. Linux user can use ethtool to set an Ethernet card speed and duplex, can I use the same command on FreeBSD?
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How do I configure networking or network interface card on HP Debian Linux U1 Server?
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I've recently installed Debian Linux 4.0 on my server and Ubuntu Linux 7.04 on Laptop. I would love to have a multiple IP address that I can use for verity of purposes. I would like to bind 4 IP's to the 'eth0' device or NIC. How do I achieve this?
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Linux change ip address

Q. How do I change ip address in Linux?

A. There are different ways to change IP address in Linux
(a) Command Line tools

(b) Modify configuration files

(c) Use GUI tools

Task: Display current IP address and setting for network interface called eth0

Use ifconfig command:
# ifconfig eth0

eth0      Link encap:Ethernet  HWaddr 00:30:48:5A:BF:46
          inet addr:  Bcast:  Mask:
          inet6 addr: fe80::230:48ff:fe5a:bf46/64 Scope:Link
          RX packets:728204 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1097451 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:62774749 (59.8 MiB)  TX bytes:1584343634 (1.4 GiB)

Task: Change IP address

You can change ip address using ifconfig command itself. To set IP address, enter command:
# ifconfig eth0 netmask up
# ifconfig eth0

To make permanent changes to IP address you need to edit configuration file according to your Linux distribution.

Change IP address under RedHat / CentOS / Fedora core Linux

=> Please read - Howto change and setup IP address in Redhat Linux

Change IP address under Debian / Ubuntu Linux

=> Please read - Howto change and setup IP address in Ubuntu / Debian based Linux distros

Q. How do I remove virtual interfaces such as eth0:1 or eth1:1?
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Q. I would like to create alias for my network card (NIC). How do I setup 2 IP address on One NIC? How do I add alias under Centos / Fedora / Debian / Ubuntu Linux?
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HowTo: Find Out Router Mac Address

How do I display or find out the MAC address for my small home / business router?
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