Chapter 5. Configuring LAN Settings
Internet Security Router User
’s Manual
28
enter the LAN IP or your ISP
’s DNS IP in the primary DNS Server IP Address field. Table 5.2
describes the DHCP configuration parameters in detail.
Table 5.2. DHCP Configuration Parameters
Field
Description
IP Address Pool
Begin/End
Specify the lowest and highest addresses in the DHCP address pool.
Subnet Mask
Enter the subnet mask to be used for the DHCP address pool.
Lease Time
The amount of time the assigned address will be used by a device connected
on the LAN.
Default Gateway IP
Address
The address of the default gateway for computers that receive IP addresses
from this pool. The default gateway is the device that the DHCP client
computers first contacted to communicate with the Internet. Typically, it is the
Internet Security Router
’s LAN port IP address.
Primary/Secondary
DNS Server IP
Address
The IP address of the Domain Name System server to be used by computers
that receive IP addresses from this pool. The DNS server translates common
Internet names that you type into your web browser into their equivalent
numeric IP addresses. Typically, the server(s) are located with your ISP.
However, you may enter LAN IP address of the Internet Security Router as it
will serve as DNS proxy for the LAN computers and forward the DNS request
from the LAN to DNS servers and relay the results back to the LAN
computers. Note that both the primary and secondary DNS servers are
optional.
Primary/Secondary
WINS Server IP
Address (optional)
The IP address of the WINS servers to be used by computers that receive IP
addresses from the DHCP IP address pool. You don
’t need to enter this
information unless your network has WINS servers.
3.
Click
to save the DHCP server configurations.
5.2.4
Viewing Current DHCP Address Assignments
When the Internet Security Router functions as a DHCP server for your LAN, it keeps a record of any
addresses it has leased to your computers. To view a table of all current IP address assignments, just go to the
DHCP Server Configuration page. A page displays similar to that shown in Figure 5.2; the bottom half of the
same page shows the existing DHCP address assignments.
The DHCP Server Address Table lists any IP addresses that are currently leased to LAN devices. For each
leased address, the table lists the following information:
Table 5.3. DHCP Address Assignment
Field
Description
MAC Address
A hardware ID of the device that leases an IP address from the DHCP server.
Assigned IP Address
The address that has been leased from the pool.
IP Address Expired
on
The time when the leased address is to be terminated.