Adjust the default IP range for internet sharing

By means of the internet sharing option in Mac OS X (client and server) it is possible to share your internet connection with other computers via your LAN or WiFi network card. An excellent OS X feature that works almost perfectly, only in my opinion it has one major limitation.

It is not possible to configure the IP range that is distributed via the internet sharing preferences. By default, Internet Sharing uses the 192.168.2.0 subnet. This IP range can cause problems when, for example, you use VPN or want to connect to another network in the 192.168.xx range.

In Mac OS X 10.5+ you can determine the IP range yourself by making an adjustment in the NAT settings used by internet sharing.

First check with Terminal or com.apple.nat.plist exists in the directory /Library/Preferences/SystemConfiguration by means of:

ls -al /Library/Preferences/SystemConfiguration/

If it does not exist yet, you must first start and stop the internet sharing, so that the plist is automatically created by OS X.

When com.apple.nat.plist is present in the directory you can change the subnet using the command below in Terminal:

sudo defaults write /Library/Preferences/SystemConfiguration/com.apple.nat SharingNetworkNumberStart 10.10.10.0

NB! run the command as one line with a space between …nat and Sharing…

As a string you indicate the IP range (/24 class-C) that you want to use, for example 10.10.10.0, then restart the internet sharing and the new IP range is active.

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