Multi-homed-that is, it’s sending traffic from multiple IP addresses. Let’s say that, through a protocol analyzer, you find aĭevice sending unwanted traffic on your network. Hardware is AmdP2, address is 0000.0000.0001 (bia 0003.e39b.9220)Īfter changing the MAC address, you can view the new one Here’s anĮnter configuration commands, one per line. Just use the command with the new MAC address-it’s that simple.
To change your MAC address on a Cisco router, use the mac-address command while in Interface Configuration However, MAC spoofing does have legitimate uses, such This term has a negativeĬonnotation because its more popular uses are for improper activities, particularly Change my MAC addressĬhanging your MAC address from the default is what we call MAC spoofing. Number of special built-in addresses such as the four displayed above in the show mac-address-table output these are Special devices such as routers and switches have a In this case, theĮach Ethernet interface on a Cisco router has its ownĮthernet MAC address. Hardware address line with the BIA (burned in address). On the second line of each interface, you’ll see the Here’s an example: RouterB# show interfaces On a Cisco router, you can find out which MAC addresses yourĬommand. Here’s an example: Switch# show mac-address-table You can find out similar information from the switch In the command’s output, you can find the MAC address under In Windows, you can find out your MAC address using the ipconfig /all command. Whatever you call it, thisĪddress is a 12-character hexadecimal string. NICs, wireless devices, routers, and switches) preprograms these addresses intoĪ MAC address can go by other names, including physical address (in Windows), Ethernet address, and hardware address. Each vendor that creates network devices (e.g., Ethernet What you might not know is what you can do with MAC addresses in the Cisco IOS.Īn Ethernet MAC address uniquely identifies every Ethernetĭevice in the world.
#SHOW MAC ADDRESS OF WIRELESS ROUTER HOW TO#
While you're probably familiar with Ethernet MAC addresses, how much do you know about working with them in the Cisco IOS? In this edition of Cisco Routers and Switches, David Davis tells you how to determine the MAC address, change it, and use it to filter traffic.Ĭhances are good that most of you know what an Ethernet MAC address is. Cisco administration 101: Understanding Ethernet MAC addresses
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