Virtual Lan; Pppoe; Defining A Virtual Lan - D-Link NetDefend DFL-210 User Manual

3.3.3. Virtual LAN

3. Check the Enable DHCP client control.
4. Click OK.
3.3.3. Virtual LAN
NetDefendOS is fully compliant with the IEEE 802.1Q specification for Virtual LANs. On a pro-
tocol level, Virtual LANs work by adding a Virtual LAN identifier (VLAN ID) to the Ethernet
frame header. The VLAN ID is a number from 0 to 4095 and is used to identify a specific Virtual
LAN. In this way, Ethernet frames can belong to different Virtual LANs, but still share the same
physical media.
The Virtual LAN support in NetDefendOS works by defining one or more Virtual LAN interfaces.
Each Virtual LAN interface is interpreted as a logical interface by the system.
Ethernet frames received by the system are examined for a VLAN ID. If a VLAN ID is found, and a
matching Virtual LAN interface has been defined, the system will consider that interface to be the
receiving interface for the frame before further processing takes place.
Virtual LANs are useful in several different scenarios, for instance, when filtering is needed
between different Virtual LANs in an organization, or when the number of interfaces needs to be ex-
panded. For more information about the latter, please see the section Using Virtual LANs to expand
firewall interfaces below.
Example 3.11. Defining a virtual LAN
This example defines a virtual LAN using a VLAN ID of 10. Note that this Virtual LAN interface will use the IP ad-
dress of the corresponding Ethernet interface, as no IP address is specified.
CLI
gw-world:/> add Interface VLAN VLAN10 Ethernet=lan Network=all-nets VLANID=10
Web Interface
1. Go to Interfaces > VLAN > Add > VLAN
2. Specify a suitable name for the VLAN, for instance VLAN10.
3. Now enter:
• Interface: lan
• VLAN ID: 10
• Network: all-nets
4. Click OK.

3.3.4. PPPoE

Point-to-Point Protocol over Ethernet (PPPoE) is a tunneling protocol used for connecting multiple
users on an Ethernet network to the Internet through a common serial interface, such as a single
Note
The number of Virtual LAN interfaces that can be defined in the system is determined
by the particular product license you have.
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Chapter 3. Fundamentals