Change MAC Address on Linux (Ubuntu / Debian)

Temporary MAC Address Change

When you change the MAC address for an interface, you need to have the network interface disabled (down) and than to set the new MAC.

You can do both this things with the command:

$ sudo ifconfig eth0 down hw ether AA:BB:CC:DD:EE:FF && ifconfig eth0 up

This sets down the eth0 interface, changes the mac to AA:BB:CC:DD:EE:FF and turns the interface back down.

Or, do it in the old fashioned way:

$ sudo ifconfig eth0 down
$ sudo ifconfig eth0 hw ether AA:BB:CC:DD:EE:FF
$ sudo ifconfig eth0 up

Read more about the ifconfig command here.

 

Permanent MAC Address Change

To set the hardware address (MAC), open the /etc/network/interface file in your favourite text editor:

$ sudo vim /etc/network/interfaces

After the network interface configuration, paste this line: hwaddress ether AA:BB:CC:11:22:33.
Note: AA:BB:CC:11:22:33 is just a sample, replace it with the MAC address you want to set for your interface.

Example, with dhcp enabled network interface:

auto eth0
iface eth0 inet dhcp
hwaddress ether AA:BB:CC:11:22:33

Example, with a network interface having a static ip:

auto eth0
iface eth0 inet static
address 192.168.0.100
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.1
hwaddress ether AA:BB:CC:11:22:33

To apply the MAC change, restart the network interface:

$ sudo /etc/init.d/networking restart

Based On:

• http://linuxg.net/set-the-mac-address-in-ubuntu-and-debian/
• http://linuxg.net/3-ways-to-temporary-change-the-mac-address-in-linux-and-unix/

Changing The Language & Keyboard Layout – Linux Distributions

Version 1.0

Author: Oliver Meyer <o [dot] meyer [at] projektfarm [dot] de>
Last edited 04/03/2008

This document describes how to reconfigure the default language and the keyboard layout on various distributions so that they suit your location. I made this howto for our VMware images where the keyboard layout is always set to German and a few users have problems to configure the language and keyboard layout on these images.

This howto is a practical guide without any warranty - it doesn't cover the theoretical backgrounds. There are many ways to set up such a system - this is the way I chose.

1 Preliminary Note

If you're using a system with a desktop environment like Gnome or KDE you should use its tools to configure the default language and the keyboard layout. In the following steps I'll show you how to change the default language and the keyboard layout within the console on various distributions.

2 Fedora 8 Server / CentOS 5.x

2.1 Default Language

system-config-language

2.2 Keyboard Layout

system-config-keyboard

3 Debian Etch Server

3.1 Default Language

dpkg-reconfigure locales

3.2 Keyboard Layout

dpkg-reconfigure console-data

4 Ubuntu 7.10 Server

4.1 Default Language

sudo set-language-env -E

4.2 Keyboard Layout

sudo dpkg-reconfigure console-setup

5 Mandriva 2008 Server

5.1 Default Language

localedrake

5.2 Keyboard Layout

keyboarddrake

6 Suse 10.X Server

6.1 Default Language

yast2

Select "System" on the left side and then "Language" on the right side. Change the language and save the settings with "Accept"

6.2 Keyboard Layout

yast2

Select "Hardware" on the left side and then "Keyboard Layout" on the right side. Change the keyboard layout and save the settings with "Accept".

 

7 Links

· Fedora: http://fedoraproject.org/

· Debian: http://www.debian.org/

· Ubuntu: http://www.ubuntu.com/

· Mandriva: http://www.mandriva.com/

· Suse: http://www.opensuse.org/

Taken From: http://www.howtoforge.com/changing-language-and-keyboard-layout-on-various-linux-distributions

NIC Auto-Negotiation and Duplex Settings - NIC satus

FAQ: How to change Duplex and/or Auto-Negotiation NIC settings in Linux?

Date: November 20, 2008. Categories: debian, faq, fedora, howtos, linux, tips and ubuntu

Q: How to disable auto-negotiation option of my network interface card and set up half/full duplex mode manually from Linux command line (CLI)? By the way, how to see current settings?
A: There are several Linux utilities coming with almost any distribution including Debian, Ubuntu, Fedora, RedHat, Mandriva, Centos whatever. See details below.

auto-nego

ethtool

This is rather powerful utility can display and change settings of ethernet network interface card. You can easily disable/enable autonegotiation option for your NIC, also it’s possible to manually set up duplex mode, configure wake-on-lan options, set speed settings. Just look through full manual page for ethtool. Here are several ethtool usage examples:

ethtool eth0 - shows current NIC settings

Settings for eth0:
     Supported ports: [ TP MII ]
     Supported link modes:   10baseT/Half 10baseT/Full
                             100baseT/Half 100baseT/Full
     Supports auto-negotiation: Yes
     Advertised link modes:  10baseT/Half 10baseT/Full
                             100baseT/Half 100baseT/Full
     Advertised auto-negotiation: No
     Speed: 10Mb/s
     Duplex: Half
     Port: MII
     PHYAD: 32
     Transceiver: internal
     Auto-negotiation: off
     Supports Wake-on: pumbg
     Wake-on: d
     Current message level: 0x00000007 (7)
     Link detected: yes

ethtool -s eth0 duplex half autoneg off - disables auto-negotiation, enables Half Duplex.
ethtool -s eth1 duplex full speed 1000 autoneg off - disables auto-negotiation, enables Falf Duplex and sets up Speed to 1000 Mb/s.

mii-tool

According to manual it allows to manipulate and see media-independent interface status. Let’s see examples:

bash-3.1# mii-tool eth0
eth0: negotiated 100baseTx-FD, link ok - shows 100 Mbps speed, Full Duplex, Auto-negotiation is on.
bash-3.1# mii-tool eth0 -F 10baseT-HD - enables 10 Mb/s Half Duplex connection.

Taken From: http://www.linuxscrew.com/2008/11/20/faq-how-to-change-duplex-andor-auto-negotiation-nic-settings-in-linux/

Change Your Mac Address in Linux

# In order to change your MAC address just type the following:

$ sudo ifconfig eth0 down hw ether 0A:0B:0C:0D:AA:BB


Note: "0A:0B:0C:0D:AA:BB" is just an example, you should put there the disired MAC address

Note: bringing down the interface (sudo ifconfig eth0 down) and them changing the mac address (sudo ifconfig eth0 hw ether 0A:0B:0C:0D:AA:BB) did not work, instead i did all in one line as shown above


# Now bring the interface back up, and you are ready to go.

$ sudo ifconfig eth0 up

Seeing and changing your DNS servers

To see which dns server that as been assingned to your by dhcp or inputed manualy, just do:

cat /etc/resolv.conf

To alter (and also see) your dns servers you can always edit /etc/resolv.conf using a text editor like vi or gedit or any other for vi do the following:

# vi /etc/resolv.conf

for gedit the following:

# gedit /etc/resolv.conf