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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Summary of Contents for NetDefend DFL-1660
Page 28: ...1 3 NetDefendOS State Engine Packet Flow Chapter 1 NetDefendOS Overview 28 ...
Page 88: ...2 6 3 Restore to Factory Defaults Chapter 2 Management and Maintenance 88 ...
Page 166: ...3 10 DNS Chapter 3 Fundamentals 166 ...
Page 254: ...4 7 5 Advanced Settings for Transparent Mode Chapter 4 Routing 254 ...
Page 268: ...5 4 IP Pools Chapter 5 DHCP Services 268 ...
Page 368: ...6 7 Blacklisting Hosts and Networks Chapter 6 Security Mechanisms 368 ...
Page 390: ...7 4 7 SAT and FwdFast Rules Chapter 7 Address Translation 390 ...
Page 414: ...8 3 Customizing Authentication HTML Pages Chapter 8 User Authentication 414 ...
Page 490: ...9 8 6 Specific Symptoms Chapter 9 VPN 490 ...
Page 528: ...10 4 6 Setting Up SLB_SAT Rules Chapter 10 Traffic Management 528 ...
Page 544: ...11 7 HA Advanced Settings Chapter 11 High Availability 544 ...
Page 551: ...12 3 5 Limitations Chapter 12 ZoneDefense 551 ...
Page 574: ...Default 512 13 9 Miscellaneous Settings Chapter 13 Advanced Settings 574 ...
Page 575: ...13 9 Miscellaneous Settings Chapter 13 Advanced Settings 575 ...