Dhcp Server - SMC Networks EZ Connect SMC70032AE User Manual

DHCP Server

The SMC70032AE can be used as a DHCP (Dynamic Host Configuration Protocol)
server. When using the DHCP server function on the SMC70032AE, all PCs on
the internal network can be set to obtain their address automatically and the
modem will pass all the necessary IP information to the PC(s) .
Once you have configured the modem in one of the Routed modes, the DHCP
configuration fields will be automatically filled with the values assigned in the
routed configuration and default DHCP values. The LAN IP address will be filled
with the LAN IP address you have already assigned to the modem and will act as
the gateway. The LAN subnet mask (Hex) is the subnet mask value assigned to
the internal network in Hexadecimal format (ex. ff:ff:ff:00 equals
255.255.255.0). Using these values, the modem automatically fills in the LAN
subnet address for your internal network.
The first option below the LAN information is whether or not you will enable the
DHCP server function and, if taking advantage of the DHCP server on the
modem, you must ensure that the 'Enable" option is selected. If you are not
planning on using the DHCP server, select "Disable" and click on the "Save"
button to exit the DHCP configuration.
Next, the DHCP server must be configured in the way it is going to send IP
information to PCs. The first two settings define the IP pool that the modem will
draw from to assign to the PCs on the internal network. The first IP address is
the starting address and the second is the ending address for the range that can
be assigned. These addresses must be on the same network as the LAN subnet
(ex. on the example network, you could assign 192.168.1.2 for the starting
address and 192.168.1.254 as the ending address since all these addresses are
on the defined subnet).
The lease time is given a default value of 600000, which indicates the seconds
that a PC receiving IP information has a reserve or "lease" on that information
before it can be given to another PC or network device. The PC will renew the
"lease" automatically when it is connected to the network and is able to
communicate with the DHCP server, which is, in this case, the SMC70032AE
modem. You can adjust the lease time if necessary and the value is, as stated
above, in seconds.
In order to be able to browse the Internet by typing domain names such as
www.smc.com in an address bar, you must be able to access a DNS (Domain
Name System) server. The address of your service provider's DNS server needs
to be entered in the DNS Server field. This address must entered for the
SMC70032AE modem's DNS Relay function to operate so that the modem can
load information from the service provider's DNS server.
If you plan on using the SMC70032AE modem as the DNS Server for your
internal network or will be using a different server on the internal network you
must click on the "Enable" option for DNS Relay (NOTE: if using "PPPoA Routed"
or "PPPoE Routed" modes, this option will not be available if you have already
selected Enable Primary DNS Relay in the routed mode configuration).
Next enter the modem's LAN IP address or the local, internal DNS server's IP
address in the DNS Server IP Address field.
The example below indicates that the SMC70032AE modem has been configured
as a DHCP server for the subnet 192.168.1.0 with a subnet mask of
255.255.255.0 (Hexadecimal ff:ff:ff:00). Since the modem has been assigned
the address of 192.168.1.1, the range of address defined for the DHCP "pool"
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