Why changing of mac address isn't recommended ?
Hi all,
Why changing of mac address isn't recommended ? The possible reasons that i can find is 1) it can break firewalls 2) it can break some DHCP implementations ? Is there any other reasons that i have missed ? |
I don't think you're likely to break a firewall or dhcp but you could stop your machine, another machine or all machines from communicating within or outside the network.
cheers |
it could break the firewall or DHCP on the user end. If static DHCP is used a MAC address change could prevent the proper IP from being assigned, and again some firewalls, and access point use MAC address filtering, changing it would prevent that from working properly, most likely resulting in no Internet connection on the affected computer. But other than for spoofing for penetration testing, security testing, or for nefarious purposes why would someone change the MAC address?
Oh yea forget udev also relies on the MAC address to assign the proper device name to the NIC i.e. eth0, eth1, etc.... |
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At one time , 3com duplicated ethernet numbers among cards with different types of network connectors; they assumed that customers would order only a single type, this shortcut raised havoc at sites that were transitioning bw media and even caused problems on 3coms own internal network. mac address conflicts are deadly on the same nw |
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