Dell PowerConnect 6248 User's Guide - Page 613

• IPv6 Prefix - Choose to Add or Delete an IPv6 prefix on this interface. If adding a prefix, specify that prefix in the following IPv6 Prefix field. Checking Delete causes deletion of a displayed IPv6 Prefix. • IPv6 Prefix - Specifies the IPv6 prefix for an interface. When the selection is changed, the screen is refreshed and valid lifetime, preferred lifetime, on-link flag, and autonomous flag fields are updated for the selected IPv6 address. • EUI-64 - If checked, specifies 64-bit unicast prefix. • IPv6 Prefix Length - Specifies the IPv6 prefix length. • Valid Lifetime by Prefix - The value, in seconds, to be placed in the Valid Lifetime field of the Prefix Information option in a router advertisement. The prefix is valid for on-link determination for this length of time. Hosts that generate an address from this prefix using stateless address autoconfiguration can use those addresses for this length of time. An auto-configured address older than the preferred lifetime but younger than the valid lifetime are considered to be deprecated addresses. As defined by RFC 2462, a deprecated address is an address assigned to an interface whose use is discouraged, but not forbidden. A deprecated address should no longer be used as a source address in new communications, but packets sent from or to deprecated addresses are delivered as expected. A deprecated address may continue to be used as a source address in communications where switching to a preferred address causes hardship to a specific upper-layer activity (for example, an existing TCP connection). The valid range is from 0 to 4,294,967,295 seconds. • Preferred Lifetime by Prefix - The value, in seconds, to be placed in the Preferred Lifetime in the Prefix Information option in a router advertisement. Addresses generated from a prefix using stateless address autoconfiguration remain preferred for this length of time. As defined by RFC 2462, a preferred address is "an address assigned to an interface whose use by upper layer protocols is unrestricted. Preferred addresses may be used as the source (or destination) address of packets sent from (or to) the interface." The range is from 0 to 4,294,967,295 seconds. • Onlink Flag by Prefix - Specifies the selected prefix that can be used for on-link determination. Default value is Enable. This selector lists the two options for on-link flag: Enable and Disable. • Autonomous Flag by Prefix - Specifies the selected prefix that can be used for autonomous address configuration. Default value is Disable. This selector lists the two options for autonomous flag: Enable and Disable. • Current State by Prefix - Interface Operational status for selected IPv6 prefix. • Routing Mode - Specifies the routing mode of an interface. This selector lists the two options for routing mode: Enable and Disable. Default value is Disable. • IPv6 Routing Operational Mode - Displays the operational state of an interface. • Interface Maximum Transmit Unit - Specifies the maximum transmit unit on an interface. If the value is 0 then this interface is not enabled for routing. It is not valid to set this value to 0 if routing is enabled. The valid range of MTU is 1280 to 1500. • Router Duplicate Address Detection Transmits - Specifies the number of duplicate address detections transmits on an interface. DAD transmits values must be in the range of 0 to 600. Configuring IPv6 613