D-Link DWS-4026 Product Manual - Page 286

D-Link Unified Access System Software User Manual 12/10/09 Field MAC Address Encapsulation Type Proxy ARP Local Proxy ARP IP MTU Bandwidth Destination Unreachables ICMP Redirects Table 177: IP Interface Configuration Fields (Cont.) Description The burned-in physical address of the specified interface. The format is six two-digit hexadecimal numbers separated by colons, for example 00:06:29:32:81:40. This value is valid for physical interfaces. For logical interfaces, such as VLAN routing interfaces, the field displays the system MAC address. Select the link layer encapsulation type for packets transmitted from the specified interface from the dropdown menu. The possible values are Ethernet and SNAP. The default is Ethernet. Select to Disable or Enable Proxy ARP for the specified interface from the dropdown menu. Select to Disable or Enable Local Proxy ARP for the specified interface from the dropdown menu. The maximum transmission unit (MTU) size of IP packets sent on an interface. Valid range is (68 to 9198). Default value is 1500. The configured bandwidth of the interface is specified in Kbps. If no bandwidth is configured, the bandwidth defaults to the actual interface bandwidth for port-based routing interfaces and to 10 Mbps for VLAN routing interfaces. This value does not affect the actual speed of an interface. Specifies the mode of sending ICMP Destination Unreachables on this interface. If this is disabled, then this interface will not send ICMP Destination Unreachables. By default, the Destination Unreachables mode is Enable. The router sends an ICMP Redirect on an interface only if Redirects are enabled both globally and on the interface. By default, the ICMP Redirects mode is Enable. • Click Submit to send the updated configuration to the switch. These changes will not be retained across a power cycle unless a Save configuration is performed. • Click Helper-IP Address to proceed to the Helper Address configuration page. Helper IP Interface Configuration Use the Helper IP Interface Configuration page to add a Helper IP address to the interface. The IP Helper feature allows the switch to forward certain configured UDP broadcast packets to a particular IP address. This allows various applications to reach servers on non-local subnets, even if the application was designed to assume a server is always on a local subnet and uses broadcast packets (with either the limited broadcast address 255.255.255.255, or a network directed broadcast address) to reach the server. You can configure relay entries both globally and on specific routing interfaces. Each relay entry maps an ingress interface and destination UDP port number to a single IPv4 address (the helper address). You can configure multiple relay entries for the same interface and UDP port, in which case the relay agent relays matching packets to each server address. Interface configuration takes priority over global configuration. That is, if a packet's destination UDP port matches any entry on the ingress interface, the packet is handled according to the interface configuration. Page 286 Configuring Global and Interface IP Settings Document 34CSFP6XXUWS-SWUM100-D7