Tip: Lease database saving between restarts
DHCP leases are, by default, remembered by NetDefendOS between system restarts.
The DHCP advanced settings can be adjusted to control how often the lease database
is saved.
The DHCP Server Blacklist
Sometimes, an IP address offered in a lease is rejected by the client. This may because the client
detects that the IP address is already in use by issuing an ARP request. When this happens, the
NetDefendOS DHCP server adds the IP address to its own blacklist.
The CLI can be used to clear the DHCP server blacklist with the command:
gw-world:/> dhcpserver -release=blacklist
Additional Server Settings
A NetDefendOS DHCP server can have two other sets of objects associated with it:
• Static Hosts.
• Custom Options.
The illustration below shows the relationship between these objects.
Figure 5.1. DHCP Server Objects
The following sections discuss these two DHCP server options.
5.2.1. Static DHCP Hosts
Where the administrator requires a fixed relationship between a client and the assigned IP address,
NetDefendOS allows the assignment of a given IP to a specific MAC address. In other words, the
creation of a static host.
Static Host Parameters
Many such assignments can be created for a single DHCP server and each object has the following
5.2.1. Static DHCP Hosts Chapter 5. DHCP Services
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