D-Link DFL-2500 User Guide - Page 79
DHCP Client
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60 Chapter 9. Interfaces interfaces on the firewall. • Create 16 Virtual LANs in the firewall, named, for instance, vlan01 to vlan16, each with a unique VLAN ID • In the switch, map each VLAN ID to a switch port, and make sure the uplink port is configured as a trunk port for all the VLAN IDs. • Each port of the switch will now be seen as a logical interface in the firewall. Thus, traffic entering the switch through, for instance, port 12 will be received by interface vlan12 in the firewall. In the example above, a gigabit uplink port on the switch and a gigabit interface on the firewall was used. Gigabit interfaces are not a requirement from a functionality perspective; any type of interface would have worked. However, from a performance perspective, gigabit interfaces are recommended. Remember that one single Ethernet link is used to carry all traffic from the 16 switch ports, each with an interface link speed of 100 Mbps. 9.3 DHCP Short for Dynamic Host Configuration Protocol, DHCP is the third-generation host configuration protocol for TCP/IP, which is based directly on the BOOTP (Boot Protocol). It is used for automatic allocation of network addresses and configurations to newly attached hosts. The purpose of using DHCP is to reduce the work necessary to administer a large IP network. There is software mechanism to keep track of IP addresses rather than requiring an administrator to manage the task. This means that a new computer can be added to a network without the hassle of manually assigning it a unique IP address. D-Link Firewall appliance can act as either a DHCP client, a server, or a relayer through the interfaces. DHCP server and relayer functions are covered in 26, DHCP Server & Relayer. 9.3.1 DHCP Client The DHCP client broadcasts message to locate a DHCP server(or servers) and receives an IP address dynamically from a DHCP server for its physical interface. A DHCP client may receive offers from multiple DHCP servers D-Link Firewalls User's Guide