If a router is between the
DHCP server and the ISA VPN server, then a DHCP relay agent is required. It is
important to verify that enough available DHCP addresses are available to accommodate
the regular load along with the additional VPN users.
. ISA VPN Server IP Address Pool??”The ISA VPN server can provide IP configuration
from a static address pool configured within the ISA Server Management Console. It
is important to configure enough IP addresses to accommodate the maximum number
of concurrent VPN users.
CAUTION
The IP addresses assigned to VPN clients must be on a different subnet than the IP
address already configured on their system. For example, many home DSL/cable firewalls
come preconfigured to assign the common 192.168.0.x or 192.168.1.x addresses
to home computers. If the ISA VPN server was configured to assign addresses in
one of these ranges to VPN users, communication would potentially not work correctly
and the VPN connection could fail.
Use the following process to configure ISA to provide an IP address from a DHCP server.
This configuration is valid only when ISA can communicate with a DHCP server, such as
when the internal network is on the same subnet as the DHCP server or a DHCP relay
agent.
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