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Cisco ASA 5500 Series Configuration Guide using ASDM
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Chapter 7 Using the Startup Wizard
Configuring IPv6 Neighbor Discovery
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.
The Interface IPv6 Prefixes Address field appears with the preferred and valid dates.
Configuring Router Advertisement Messages
Router advertisement messages (ICMPv6 Type 134) are periodically sent from each IPv6 configured
interface of the adaptive security appliance. The router advertisement messages are sent to the all-nodes
multicast addressFigure 7-2 shows an example of a router advertisement message.
Figure 6-2 shows the flow of router advertisement messages from an IPv6 configured interface.
Figure 7-2 IPv6 Neighbor Discovery—Router Advertisement Message
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Router advertisement packet definitions:
ICMPv6 Type = 134
Src = router link-local address
Dst = all-nodes multicast address
Data = options, prefix, lifetime, autoconfig flag
Router
advertisement
Router
advertisement
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