Before you actually write to the EEPROM, you should backup the original EEPROM !! CAUTION !! Writing to the EEPROM of the network device could brick the device. So, how could the MAC address 00:50:b6:33:c5:e5 be permanently changed to 00:11:22:33:44:55? Retrieving an EEPROM dump from the network interfaceīy writing directly to the EEPROM of the network device, it is possible to change the MAC address. Obtaining the current MAC address and changing it permanentlyįirst, let's have a look at the current MAC address: $ ip a show dev eth0ĩ: eth0: mtu 1500 qdisc fq_codel state DOWN group default qlen 1000 By the way, for this example I used a USB-to-Ethernet adapter. In this case, my interface is using the asix driver. If you want to find out more details about the driver your interface is using, just add the -i argument: $ sudo ethtool -i eth0įirmware-version: ASIX AX88772B USB 2.0 Ethernet Supported link modes: 10baseT/Half 10baseT/FullĪs you can see, the link is detected, the speed is set to 1000Mb/s and Auto-negotiation is enabled. It can help to determine whether you are connected to a network or not, what the speed of the link is and if auto-negotiation is enabled.įor some basic information about a network interface, just call ethtool without command line arguments: $ sudo ethtool eth0 But let's have a look at some basic ethtool commands first: Brief explanation of ethtoolĮthtool comes in handy when you want to debug your network interfaces. In this post I will demonstrate a method how to set the MAC address of an ethernet device permanently, so that even if you connect the device to another computer, it still uses the modifies MAC address. While these changes are only temporary, it's also possible to instruct the operating system to set the MAC address straight after booting, for example by modifying files like /etc/network/interfaces.īut still, these changes would only apply to the current operating system and is not bound to the hardware itself. Ip link set eth0 address xx:xx:xx:xx:xx:xx Macchanger-ng -mac xx:xx:xx:xx:xx:xx eth0 If you're using a Linux-based operating system, this can be done using one of the following commands: Escaping from Mozilla Firefox in Restricted Environments How to permanently change a MAC address using ethtool Network Security Implications of Host Models About How to permanently change a MAC address using ethtool Ĭhanging the MAC address of a network interface can be a common task if you either change addresses for privacy reasons or if you're performing security assessments.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |