Fedora :: Change Your MAC Address On Boot ?

Nov 22, 2009

I have a dual-boot laptop where both are configured as clients for bacula (backup software). Since it is a laptop and it gets used outside the network where the backup is done, I can't just assign a static IP and be done; it really needs to accept an address via DHCP.

Changing the MAC address is easy:

Code:

But if you do this manually, then you'll need to restart your connection. I don't want to do that, I want the laptop to just come up with the correct address in the first place because one day I will forget to change it and the backup system will be very confused (and I will be very sad when I find myself needing that backup).

The solution is to run an init script prior to starting the network. Below is the script I am using, with someone marginal comments. It is based on the network script in /etc/rc.d/init.d, heavily edited. You will need to add one parameter to your ifcfg-ethX configuration file to set the desired MAC address. That parameter MACADDR does not seem to be used by any of the init scripts. You will find it in some of the scripts in network-scripts, but it is not used as an input parameter, but rather set by querying the NIC, thus this use does not conflict.

Here's the script:

Code:

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Ubuntu Networking :: Change WLAN0 MAC Address At Every Boot

Jul 29, 2011

change my WLAN0 MAC address in my Kubuntu Natty 64 bit at every boot. I have done quite a bit of searching and found some procedures that appear to have worked back in 9.04 and before days but I have been unable to get anything to work for me in my 11.04 install. I have tried adding a script to if.pre-up.d and also tried adding a bootmisc.sh and either I did them wrong or they are not working. I want to make sure that every time I bring the wireless up in Kubuntu that I have the changed MAC address. I usually keep wireless disabled and turn it on just when I need it.

Background so you don't think I am doing something nefarious... I am going on a cruise soon. The cruise line sells wireless internet subscriptions for the duration of the cruise but they tie it to a MAC address. I am bringing my CDMA android phone that unless I use VOIP will be unable to call at all or at least with very high charges. But I also want to be able to browse the internet with my laptop. I figure it will be easier to spoof my phones MAC with the PC than the other way around. I just need to turn one device off if I am using the other. I need the MAC address to be semi permanent so I don't turn it on by mistake and have forgotten to change the MAC.

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Fedora Networking :: How To Change The Mac Address

Feb 17, 2009

Some people may need to change the mac address of their ethernet network cards. This can be easily done with fedora with command line. Just follow the steps below:

1. Log as root on a textual console (ctrl+F2) or through "su -" command in your console

2. Print your network configuration with ifconfig

[root@localhost ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:23:8B:6A:7E:9E
inet addr:10.1.128.244 Bcast:10.1.255.255 Mask:255.255.0.0
inet6 addr: fe80::218:8bff:fedb:7e9e/64 Scope:Link

[code].....

Here, eth0 is the ethernet interface of your system. The mac address is put in red.

3. Change your mac address using the following syntax

ifconfig eth0 hw ether 00:18:8BA:7E:90

The new value (in green) must be hexadecimal

4. if you have a dhcp server that distributes the adresses automatically, then request a new adress for your eth0 interface

[root@localhost ~]# dhclient eth0

5. Now, your interface is up and have a new mac and IP addresses. This feature may be useful if the network administrator ban you according to the mac adress, for example .........

[URL]

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Mar 26, 2011

I've just reinstalled F14 with KDE rather than Gnome and I'm finding that I'm unable to assign a static IP address to my wired connection.

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How can I get around this? Should I install the networkmanager-gnome package?

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Mar 3, 2009

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May 26, 2009

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Mar 30, 2009

I've been trying to research this, but I don't really understand IP routing and it's bugging me that I can't fix this problem. I have a dedicated server (fedora core 7) with 3 IP addresses on the same eth0 interface. On the default IP address 62.193.226.127, there is some routing problem because I can't connect from the server to some other sites. Using one of the other IP addresses, like 62.193.252.129, I can connect fine. Additionally this address is better for sending mail because it coincides with the main domain name from which the mail is sent.My question is: how can I configure networking so that outgoing traffic from the box goes via 62.193.252.129?

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Jan 5, 2010

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Ubuntu :: Cannot Change Mac Address?

Jul 27, 2011

I use GNU MAC Changer. It changes my local network connection mac adress properly. But it does not changes my wireles mac adres. I try it with sudo ofcourse the error which i get is : "ERROR: Can't change MAC: interface up or not permission: Too many open files in system". I disable the wireles connection and then try to change the mac but i get the same error. I try these commands :

# ifconfig eth0 down
# ifconfig eth0 hw ether 00:80:48:BA:d1:30
# ifconfig eth0 up

[code]....

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Aug 13, 2011

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Aug 11, 2010

I have setup a machine with Ubuntu 10.04 server and i have installed a KNC card for Streaming the channels. Everything is good so far and here is the real deal .. i wanna change the MAC address of the KNC card to try different things. I know how to change the MAC address of the LAN card but not sure about the KNC card. I tried few things by installing macchanger.. but didn't work out. Can any one tell me whether its possible to change the MAC of the KNC card and other tricks.Here is a little info:-

[ 11.344208] saa7146: register extension 'budget_av'.
[ 11.344704] budget_av 0000:04:01.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
[ 11.344739] IRQ 22/: IRQF_DISABLED is not guaranteed on shared IRQs

[code]...

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Mar 3, 2010

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My 3rd PC is a ubuntu Desktop is there a program i can use or a command i can use to spoof the mac address.

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Jan 3, 2011

I have an old Suse 8 installation on a vmware-host, where I had to change ip-addresses. Now something isn't working as it shouldn't:
- Proftpd isn't recognizing the old pw's (coming from a my-sql db)
I am not a real expert on linux, where is the address "192.168.1.37" configured on my machine? The Mysql daemon is running on this IP.

I can ping it: Code: web10:~ # ping 192.168.1.37
PING 192.168.1.37 (192.168.1.37) from 192.168.1.37 : 56(84) bytes of data.
64 bytes from 192.168.1.37: icmp_seq=1 ttl=64 time=0.024 ms
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Code: web10:~ # ifconfig -a
eth0 Link encap:Ethernet HWaddr 00:0C:29:79:47:DF
inet addr:88.198.100.35 Bcast:88.198.100.39 Mask:255.255.255.248
inet6 addr: fe80::20c:29ff:fe79:47df/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:563 errors:0 dropped:0 overruns:0 frame:
TX packets:272 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:58845 (57.4 Kb) TX bytes:23467 (22.9 Kb)
Interrupt:19 Base address:0x2024

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:63 errors:0 dropped:0 overruns:0 frame:0
TX packets:63 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:5807 (5.6 Kb) TX bytes:5807 (5.6 Kb)

sit0 Link encap:IPv6-in-IPv4
NOARP MTU:1480 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
route: Code: web10:~ # route -n
Kernel IP routing table ....
Where else the IP 192.168.1.37 is configured?

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But some servers I work with wireless in my town and I need to always be changing the MAC Address of my wireless adapter. Whenever I make the change, which is in the Linux distribution is already using it, when I enter the command:

Come to me the message:

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Jul 30, 2010

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Input string:
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Output string
ethaddr=00:21:04:4D:BB:05

I'm not experienced with sed.

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Nov 4, 2009

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5.) How do I install Flash Player?

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Apr 3, 2010

I've recently changed the motherboard of a redhat server that's been running fine otherwise. The new motherboard is different to the old one. I can't boot in now; getting "Kernal panic: VFS : Unable to mount root fs on 00:00" messages. I've run mkinitrd to rebuild the image file and have changed the grub.conf line to point to the new image file but it still occurs.

title Red Hat Linux (2.4.25)
root (hd0,0)
kernal /vmlinuz-2.4.18-14 ro root=LABEL=/
initrd /initrd.img.2.4.18-14

However; during the bootup I spy some "unknown IDE device" errors along with some "IRQ resource cannot be reserved" and/or "Could not enable IDE device" or similar messages. As per attached image.

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..... and so on
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Aug 13, 2011

I have to change my MAC address in order to get an IP lease via DHCP. But almost no installer CDs have ifconfig and dhclient.

ifconfig eth0 down
ifconfig eth0 hw ether 00:22:15:C0:27:23
ifconfig eth0 up
dhclient eth0

Is there any way to change a MAC address within Debian or Ubuntu installer CDs?

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Apr 11, 2010

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The instruction told me to put:
auto eth0
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gateway 192.168.1.1

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192.168.0.3
etc...

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