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  1. #11
    Untangle Ninja sky-knight's Avatar
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    Quote Originally Posted by Zcubed View Post
    You must only have a few computers to administer and no laptops. Try your solution on a network with 1,000s of computers and many laptops going between sites. What a nightmare!

    Your thinking is very shortsighted and I think the opposite of what you are suggesting would be true. Static for home installation and DHCP for larger installs.
    Ditto, anyone with real experience with a network knows DHCP is a life saver. Also, DHCP reservations are useful for servers as well, it provides a single place to self-document your entire commercial IP space. It does however introduce a point of failure at your DHCP server so you have to design around that.

    Brainz.. to work around your issue. Open device manager, hit the network card's properties, go to advanced, select network address, fill in the box with a MAC address of your choice, click OK.

    Who says you have to lose your MAC if you swap nics? All you have to do is make sure the MAC is unique to your network and you're golden. Generate your own make the configuration per user and move on with your day.
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

  2. #12
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    Who says you have to lose your MAC if you swap nics? All you have to do is make sure the MAC is unique to your network and you're golden. Generate your own make the configuration per user and move on with your day.

    SkyNight;
    I was looking for a way to filter traffic by MAC address and this thread caught my eye. I am a bit of a noob but I wanted to know what are the implications if I send a laptop out into the wireless world and it stumbles upon a device with the same mac address?

    I know that there are IP address reserved for private use, e.g 192.168.1.xxx.
    Is there a range of MAC addresses for the same purpose?

    Thx in advance

  3. #13
    Untangle Ninja sky-knight's Avatar
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    Yes, however, MAC addresses don't go past the first router. If you do get into a situation where you have two interfaces on the same network with the same MAC address strange things start to happen. You'll end up with chronic IP conflicts because the DHCP server will hand you the other machines IP address... arp won't resolve so you won't get proper switching... heck cheap switches can lockup outright. That is why I said generate your own, if you reuse an address from another piece of equipment you might run into duplication problems.

    As for a reserved range of MAC addresses? Not that I'm aware of, the MAC is carved up by manufacturer. The first 3 sets of numbers match the company that built the card. This is all controlled by the IEEE.

    http://standards.ieee.org/regauth/oui/oui.txt
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

  4. #14
    Untangle Ninja sky-knight's Avatar
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    Don't you know there are several ranges in that list that are locked to "PRIVATE" I'm not sure if that means the same thing... but one of the prefixes being 10:00:00 sure does LOOK the same as the 10.x.x.x private range. So I guess this technically means you can use 10:00:00:xx:xx:xx:xx:xx and fill the x's in with literally anything and be ok?
    Rob Sandling, BS:SWE, MCP
    NexgenAppliances.com
    Phone: 866-794-8879 x201
    Email: support@nexgenappliances.com

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