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31-8
Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 31 Configuring IPv6 Neighbor Discovery
Configuring the Router Lifetime Value
Step 7 Click Apply to save the running configuration.
Configuring the Router Lifetime Value
To configure the router lifetime value in IPv6 router advertisements on an interface, perform the
following steps:
Step 1 Choose Configuration > Device Setup > Interfaces.
Step 2 Select the interface for which you want to configure the lifetime value.
The interface must have been configured with an IPv6 address. For more information see the
“Configuring IPv6 Addresses on an Interface” section on page 31-9.
Step 3 Click Edit.
The Edit Interface dialog box appears with three tabs: General, Advanced, and IPv6.
Step 4 Click the IPv6 tab.
Step 5 In the RA Lifetime field, enter a valid lifetime value.
Step 6 Click OK.
Step 7 Click Apply to save the running configuration.
Configuring DAD Settings
To specify DAD settings on the interface, perform the following steps:
Step 1 Enter the number of allowed 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 range from 0 to 600. A zero value disables DAD processing on the specified interface. The default
is one message.
Step 2 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.
Step 3 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 1000 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.
Step 4 Enter the amount of time that IPv6 router advertisement transmissions are considered valid. Valid values
are from 3 to 1800 seconds. The default is 200 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. By default, these
transmissions are sent every 400 to 600 seconds.