25-7
Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 25 Configuring IPv6 Neighbor Discovery
Configuring Neighbor Solicitation Messages
performed first on the new link-local address. When the link local address is verified as unique, then
duplicate address detection is performed all the other IPv6 unicast addresses on the interface. For more
information about DAD, see the “Configuring DAD Settings” section on page 25-5.
Step 6 In the Interface IPv6 Addresses area, click Add.
The Add IPv6 Address for Interface dialog box appears.
Step 7 (Optional) Check the EUI-64 check box.
Step 8 Click OK to save your settings.
The Interface IPv6 Addresses Address field appears with the modified EUI-64 address.
Note You cannot use IPv6 addresses for the failover LAN and state links. For more information, see
the “Configuring Failover with the High Availability and Scalability Wizard” section on
page 58-2.
Step 9 To continue, see the “Configuring IPv6 Prefixes on an Interface” section on page 25-7.
Configuring IPv6 Prefixes on an Interface
To configure IPv6 prefixes on an interface, perform the following steps:
Step 1 In the Interface IPv6 Prefixes area, click Add.
The Add IPv6 Prefix for Interface dialog box appears.
Step 2 Enter the IPv6 address with the prefix length.
Step 3 (Optional) To configure the IPv6 address manually, check the No Auto-Configuration check box. This
setting indicates to hosts on the local link that the specified prefix cannot be used for IPv6
autoconfiguration.
Step 4 (Optional) To indicate that the IPv6 prefix is not advertised, check the No Advertisements check box.
Step 5 (Optional) The Off Link check box indicates that the specified prefix is assigned to the link. Nodes
sending traffic to addresses that contain the specified prefix consider the destination to be locally
reachable on the link. This prefix should not be used for on-link determination.
Step 6 In the Prefix Lifetime area, click the Lifetime Duration radio button, and specify the following:
a. A valid lifetime for the prefix in seconds from the drop-down list. This setting is the amount of time
that the specified IPv6 prefix is advertised as being valid. The maximum value represents infinity.
Valid values are from 0 to 4294967295. The default is 2592000 (30 days).
b. A preferred lifetime for the prefix from the drop-down list. This setting is the amount of time that
the specified IPv6 prefix is advertised as being preferred. The maximum value represents infinity.
Valid values are from 0 to 4294967295. The default setting is 604800 (seven days).
Step 7 To define a prefix lifetime expiration date, click the Lifetime Expiration Date radio button, and specify
the following:
a. Choose a valid month and day from the drop-down list, and then enter a time in hh:mm format.
b. Choose a preferred month and day from the drop-down list, and then enter a time in hh:mm format.
Step 8 Click OK to save your settings.
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