HP MSM7xx Management And Configuration Manual page 74

Network configuration
Address allocation
The following two fields let you attach information to the DHCP request (as defined by DHCP
relay agent information option 82) which lets the DHCP server identify the controller.
 Circuit ID: Use this field to identify the user that issued the DHCP request.
 Remote ID: Use this field to identify the controller.
You can use regular text in combination with the following placeholders to create the
information in each field. Placeholders are automatically expanded when the request is sent.
The following placeholders can be used:
 %S: SSID to which the user is associated.
 %B: BSSID to which the user is associated.
 %V: VLAN to which the user is mapped.
Server
Primary DHCP server address
Specify the IP address of the first DHCP server to which the controller should forward DHCP
requests.
Secondary DHCP server address
Specify the IP address of the backup DHCP server to which the controller should forward
DHCP requests.
Note
 The DHCP servers must be reachable via one of the ports on the controller.
 Routes must be defined on the DHCP server so that the DHCP server can successfully
send DHCP response packets back to the DHCP relay agent running on the controller.
These should be static and persistent HOST routes that must identify the IP address
assigned to the controller's LAN port or an additional VSC relay IP address, (i.e.
192.168.1.1). On Windows, such a static route would look like this:
route add 192.168.1.1 mask 255.255.255.255 10.10.10.22 metric 1 –p
 DHCP relay is not supported via the Internet port when it is operating as a PPPoE client.
 DHCP relay cannot work via the Internet port if the internal firewall is set to High and
NAT is enabled on the Internet port. The DHCP server must be able to ping the assigned
address to prevent duplicate assignments.
Extend Internet port subnet to LAN port
When enabled, the controller will alter the DHCP address requests from client stations so that
they appear to originate from the network assigned to the Internet port on the controller. This
will cause the DHCP server to assign IP addresses on this network to all client stations. The
controller handles all mapping between the two subnets internally.
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