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Originally Posted by sollp
Didn't think you could change tha MAC address, thought this was permanent to what ever hardware device it is given to when made. The IP address gives it the route, the MAC address is unique and permanent to the device, IE MAC adress of modem, network card ect.
It's the IP address that will change as it is dynamic on the network and not static, this is something given to the modem via the DHCP server.
So you can't force a change until the lease has expired and your given a new one. you may need to turn off the modem for a few days for this to happen.
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You change the mac address by physically changing the network device (e.g. change the ethernet card, move to USB connection, etc.) As the lease for the old mac address is still active, the DNS server will issue a new IP address for the new mac address.
However, as has alreaddy been stated, a firewall could/would have prevented the attack in the first place and be preventing it now. ("Could/would" because you have to configure it correctly!).
No one should ever go on-line with out a firewall; even the free firewalls provide a good level of protection if configured correctly.