Enabling Dhcp - D-Link NetDefend DFL-210 User Manual

IP Addresses
IP Addresses
Each Ethernet interface is required to have an Interface IP Address, which can be either a static ad-
dress or an address provided by DHCP. The interface IP address is used as the primary address for
communicating with the system through the specific Ethernet interface.
The standard is to use IP4 Address objects to define the addresses of Ethernet interfaces. Those ob-
jects are normally auto-generated by the system. For more information, please see Section 3.1.5,
"Auto-Generated Address Objects".
In addition to the interface IP address, a Network address is also specified for the Ethernet interface.
The Network address provides information to NetDefendOS about what IP addresses are directly
reachable through the interface, i.e. residing on the same LAN segment as the interface itself. In the
routing table associated with the interface, NetDefendOS will automatically create a direct route to
the specified network over the actual interface.
Default Gateway
Optionally, a Default Gateway address can be specified for an Ethernet interface. This setting tells
NetDefendOS how to reach hosts for which no routes exist. In other words, if a Default Gateway ad-
dress has been specified, NetDefendOS will automatically create a default route (destination net-
work 0.0.0.0/0) over the actual interface using the specified gateway. For natural reasons, only one
Ethernet interface at a time can be assigned a default gateway.
3.3.2.2. Using DHCP on Ethernet Interfaces
NetDefendOS includes a DHCP client for dynamic assignment of address information. The informa-
tion that can be set using DHCP includes the IP address of the interface, the local network that the
interface is attached to, and the default gateway.
All addresses received from the DHCP server are assigned to corresponding IP4Address objects. In
this way, dynamically assigned addresses can be used throughout the configuration in the same way
as static addresses. By default, the objects in use are the same ones as defined in Section 3.1.5,
"Auto-Generated Address Objects".
Example 3.10. Enabling DHCP
CLI
gw-world:/> set Interface Ethernet wan DHCPEnabled=Yes
Web Interface
1. Go to Interfaces > Ethernet
2. In the grid, click on the ethernet object of interest.
Note
The startup process will enumerate all available Ethernet interfaces. Each interface
will be given a name of the form lanN, wanN and dmz, where N represents the number
of the interface if your D-Link Firewall has more than one of these interfaces. In most
of the examples in this guide lan is used for LAN traffic and wan is used for WAN
traffic. If your D-Link Firewall does not have these interfaces, please substitute the
references with the name of your chosen interface.
Tip
Multiple IP addresses can be specified for an Ethernet interface by using the ARP
Publish feature. (See section Section 3.4, "ARP").
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Chapter 3. Fundamentals