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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 14 Completing Interface Configuration (Routed Mode)
Completing Interface Configuration in Routed Mode
d. Click OK.
Step 6 (Optional) In the top area, customize the IPv6 configuration by configuring the following options:
• DAD Attempts—This setting configures the number of consecutive neighbor solicitation messages
that are sent on an interface while DAD is performed on IPv6 addresses. Valid values are from 0 to
600. A zero value disables DAD processing on the specified interface. The default is one message.
• NS Interval—Enter the neighbor solicitation message interval. The neighbor solicitation message
requests the link-layer address of a target node. Valid values are from 1000 to 3600000 milliseconds.
The default is 1000 milliseconds.
• Reachable Time—Enter the amount of time in seconds that a remote IPv6 node is considered
reachable after a reachability confirmation event has occurred. Valid values are from 0 to 3600000
milliseconds. The default is zero. A configured time enables the detection of unavailable neighbors.
Shorter times enable detection more quickly; however, very short configured times are not
recommended in normal IPv6 operation.
• RA Lifetime—Enter the amount of time that IPv6 router advertisement transmissions are considered
valid. Valid values are from 0 to 9000 seconds. The default is 1800 seconds. Router advertisement
transmissions include a preference level and a lifetime field for each advertised router address.
These transmissions provide route information and indicate that the router is still operational to
network hosts.
• RA Interval—Enter the interval between IPv6 router advertisement transmissions. Valid values are
from 3 to 1800 seconds. The default is 200 seconds. To list the router advertisement transmission
interval in milliseconds, check the RA Interval in Milliseconds check box. Valid values are from
500 to 1800000 milliseconds.
• To allow the generation of addresses for hosts, make sure that the Suppress RA check box is
unchecked. This is the default setting if IPv6 unicast routing is enabled. To prevent the generation
of IPv6 router advertisement transmissions, check the Suppress RA check box.
Step 7 (Optional) To configure which IPv6 prefixes are included in IPv6 router advertisements, complete the
following.
By default, prefixes configured as addresses on an interface are advertised in router advertisements. If
you configure prefixes for advertisement using this area, then only these prefixes are advertised.
a. In the Interface IPv6 Prefixes area, click Add.
The Add IPv6 Prefix for Interface dialog box appears.