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I have a 2009 iMac running OS X 10.6.8. I would like to filter certain IP/MAC addresses from accessing my WiFi via "Internet Sharing". I have already set a password, but I would still like to filter specific IP/MAC addresses.

Is this possible on my iMac with 10.6.8 ?

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  • Please add your network topology. Which interface is connected to the internet via router/directly and how is the client you want to ban connected to your Mac?
    – klanomath
    Aug 24, 2015 at 16:34
  • I'm unsure what you mean by network topology. My iMac is connected to the internet directly via ethernet cable and sharing its connectivity using WiFi via the "Internet Sharing" option.
    – KlausCode
    Aug 24, 2015 at 21:13
  • That's already appropriate.
    – klanomath
    Aug 24, 2015 at 21:16
  • If you have trouble with your editing of bootpd.plist have a look at this receipe which I used for the exact same purpose on Lion up to Yosemite: apple.stackexchange.com/a/49476/22003
    – dan
    Feb 23, 2019 at 11:03

1 Answer 1

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Apparently it's possible to enable MAC filtering using the Internet Sharing feature in Snow Leopard.

Here is an extended description how to do it and at the same time overcome some flaws of the sharing implementation of SL.

Essentially you have to add an additional key/array in the /etc/bootpd.plist containing the MAC as string:

    ....
    <key>allow</key>
    <array>
            <string>0:17:43:a3:2d:45</string>
    </array>
    ...

Probably the opposite: deny/MAC-address works as well.

Please check the whole article and implement the respective modifications.

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