System information
151Chapter 9 Customizing Services
By asking users to change their network addresses:
You can ask VPN users to change the IP addresses on their home networks or other m
local networks to not begin with the same three numbers as the IP addresses on your
local network.
For example, if your local IP addresses begin with 192.168.1, ask VPN users to use IP
addresses beginning with 192.168.2 on their home networks. Private networks can use
addresses beginning with 192.168.0 through 192.168.254, 10.0.0 through 10.254.254,
172.16.0 through 172.31.254. In all cases, use subnet mask 255.255.255.0.
By changing your local network addresses:
Instead of asking VPN users to change their home network addresses, you can change
the IP address of all the devices on your server’s local network. This includes your
AirPort Base Station or other router, server, and other computers.
Change your local IP addresses so your IP subnet is dierent from the most common m
defaults on base stations and other routers: 10.0.1, 192.168.0, and 192.168.1.
You can simply pick a dierent number between 2 and 254 for the third number of
your local IP addresses. For example, if your local network IP addresses begin with
192.168.1, change them to begin with 192.168.58 or 192.168.177. If your local IP addresses
begin with 10.0.1, change them to begin with 10.0.29 or 10.0.103. You can also use
172.16.0 through 172.31.255. In all cases, use subnet mask 255.255.255.0.
Be sure to change the IP addresses that your AirPort Base Station, other Internet
router, or DHCP server assigns to computers on your network. You make these changes
on an AirPort Base Station using AirPort Utility (located in /Applications/Utilities/).
For instructions, open AirPort Utility and then use the Help menu. For information
about conguring another kind of Internet router or gateway, see its documentation.