User manual

with a particular MAC address. When a request for a DHCP lease is received on the interface,

NetDefendOS checks the MAC address of the requesting DHCP client against the list. If a match is

found, the IP address that has been associated with the MAC address is the one that is handed out.

The screenshot below shows how this option appears in the web interface. Combinations of IP

address and MAC address can be added to the list. The red icon on the right of each entry can be

clicked to delete the entry.

This feature allows the same IP address to be always allocated to a particular DHCP client.

Transparent Mode and the Interface IP Address

There are some considerations that should be noted with the LAN IP address when transparent

mode is enabled:

• In transparent mode, the LAN interface will take on the same IP address as the WAN interface.

• If DHCP is enabled on the WAN interface and the IP address on WAN cannot be refreshed

within its DHCP lease time then it will receive the IP address 0.0.0.0 and the LAN interface will

also receive this IP address.

This will mean that it will not be possible for the administrator to connect through the LAN

interface with a browser to perform management tasks while the LAN interface has the 0.0.0.0

IP address.

These IP address considerations are also true if transparent mode is enabled on the DMZ interface.

3.3. LAN Settings Chapter 3. The System Menu