Invalid MAC Address message ?

I'm trying to configure my Verizon firewall, which is MAC address authenticating, to allow a new machine. It's an older Windows Vista machine, and I obtain the MAC via IPCONFIG /ALL. I take the MAC's I see there and try to enter them into the Firewall config section of the router config, and it says "Invalid MAC Address" ? What's going on here?!
BTW, I already have about 8 machines configured and working just fine.
Solved!
Go to Solution.

While I see you solved your issue, there is a (or are) problem(s) to be aware of.
#1 MAC Address(es) are always sent in clear regarless if the type of encryption.
#2 Since it is possible to spoof/clone a MAC Address on a router (for example as shown at http://ui.linksys.com/files/E4200/2.0.25/wanmac.html ) it is also possible to spoof/clone the MAC Address on a computer.
#3 If someone does not know how to spoof/clone the MAC Address on their computer if you do not use wireless encryption (WEP, WPA, WPA2) to protect your wireless network, that someone can still see your traffic.
If you are the original poster (OP) and your issue is solved, please remember to click the "Solution?" button so that others can more easily find it. If anyone has been helpful to you, please show your appreciation by clicking the "Kudos" button.

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