System information

128 Chapter 8 Customizing Services
Important: These are addresses on the server’s network, and they must not be used by
other computers or devices on the network. This range of addresses must not include
any static IP addresses in use on the network or overlap the range of IP addresses that
the DHCP server assigns.
To change the IP address range for VPN service:
1 In the VPN pane of Server Preferences, change the first IP address in the range, the last
IP address in the range, or both.
The range of addresses needs to be large enough for the maximum number of remote
computers that will have concurrent VPN connections. VPN service assigns an IP
address for the duration of a VPN connection, and reclaims the address assigned to a
remote computer that disconnects.
2 If you have an AirPort Base Station or other Internet router (gateway) that provides
DHCP service, you may need to adjust its IP address range so that the DHCP and VPN
address ranges don’t overlap.
For information about changing the settings of an Internet router, see its
documentation.
When a remote computer makes a VPN connection, the server assigns the remote
computer an unused IP address from the range of reserved addresses. This IP address
doesn’t replace the IP address that the remote computer is already using to connect to
the Internet. The remote computer keeps this IP address and any other IP addresses it’s
using, and adds the IP address assigned to it for VPN.