D-Link DFL-260E User Manual for DFL-260E - Page 110
Note: A gateway IP cannot be deleted with DHCP enabled, Enable DHCP Client, DHCP Hostname
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3.4.2. Ethernet Interfaces Chapter 3. Fundamentals • Enable DHCP Client NetDefendOS includes a DHCP client feature for dynamic assignment of address information by a connected DHCP server. This feature is often used for receiving external IP address information from an ISP's DHCP server for public Internet connection. The information 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". By default, DHCP is disabled on Ethernet interfaces. If the interface is being used for connection to the public Internet via an ISP using fixed IP addresses then DHCP shouldn't be used. DNS server addresses received through DHCP on an interface named will be allocated to NetDefendOS address objects with the names _dns1 and _dns2. Note: A gateway IP cannot be deleted with DHCP enabled If DHCP is enabled for a given Ethernet interface then any gateway IP address that is defined for that interface cannot be deleted. To remove the gateway address, the DHCP option must be first disabled. If DHCP is enabled then there is a set of interface specific advanced settings: i. A preferred IP address can be requested. ii. A preferred lease time can be requested. iii. Static routes can be sent from the DHCP server. iv. Do not allow IP address collisions with static routes. v. Do not allow network collisions with static routes. vi. Specify an allowed IP address for the DHCP lease. vii. Specify an address range for DHCP servers from which leases will be accepted. • DHCP Hostname In some, infrequent cases a DHCP server may require a hostname to be sent by the DHCP client. • Enable Transparent Mode The recommended way to enable Transparent Mode is to add switch routes, as described in Section 4.7, "Transparent Mode". An alternative method is to enable transparent mode directly on an interface with this option. When enabled, default switch routes are automatically added to the routing table for the interface and any corresponding non-switch routes are automatically removed. • Hardware Settings In some circumstances it may be necessary to change hardware settings for an interface. The available options are: i. The speed of the link can be set. Usually this is best left as Auto. 110