User's Manual

UTT Technologies Chapter 7 Advanced Setup
http://www.uttglobal.com Page 157
7.8.2.1.3 DHCP Manual Binding
Through DHCP manual binding, you can assign a static IP address to a specific host
(client). You may create a manual binding by mapping the IP address to the host¶s MAC
address, Remote ID or Client ID. The DHCP server will always assign the specified IP
address to the host that matches the manual binding.
7.8.2.1.4 IP Address Allocation Policy
A DHCP server assigns an IP address to a client based on some parameters contained in
the message sent by the client. The parameters are Remote ID, Circuit ID (i.e., Relay
Agent ID), giaddr (i.e., Relay Agent IP), Client ID and MAC address, and the priorities of
them are descending. Only the highest priority parameter will be effect when more than
one parameter is configured. When a matching parameter is found, the DHCP server will
assign an address according to this parameter related configuration. If no matching
parameter is found, the DHCP server will find an IP address that can be allocated
according to the default sequence.
Specifically, a DHCP server assigns an IP address to a client according to the following
sequence:
1˅ If the message sent by the client contains Remote ID option, the DHCP server will
search the DHCP manual binding list to find out if there is an IP address bound to this
Remote ID. If a match is found, the DHCP server will assign the specified IP address
to the client. Else, do the next step.
2˅ If the message sent by the client contains Circuit ID option, the DHCP server will
search the DHCP address pool list to find out if there is an address pool which is
configured with this Circuit ID. If a match is found, the DHCP server will assign an IP
address from this address pool. Else, do the next step.
3˅ If the giaddr field contained in a message sent by a client is not 0, the DHCP server
will search the DHCP address pool list to find out if there is an address pool which is
configured with this giaddr. If a match is found, the DHCP server will assign an IP
address from this address pool. Else, do the next step.
4˅ If the message sent by the client contains Client ID option, the DHCP server will
search the DHCP manual binding list to find out if there is an IP address bound to this
Client ID. If a match is found, the DHCP server will assign the specified IP address to
the client. Else, do the next step.
5˅ The DHCP server will search the DHCP manual binding list to find out if there is an IP
address bound to the MAC address of the client. If a match is found, the DHCP server
will assign the specified IP address to the client. Else, do the next step.
6˅ If the message sent by the client contains Requested IP Address option, the DHCP
server will search the DHCP address pool list to find out if there is an address pool
contains this Requested IP Address. If a match is found, and this Requested IP