Cisco FirePOWER ASA 5500 series Configuration Manual page 593

Chapter 30 Configuring Tunnel Groups, Group Policies, and Users
If the configured rekey interval is very short, users might find the repeated authorization requests
inconvenient. To avoid repeated authorization requests, disable reauthentication. To check the
configured rekey interval, in monitoring mode, enter the show crypto ipsec sa command to view the
security association lifetime in seconds and lifetime in kilobytes of data. To disable user reauthentication
on IKE rekey, enter the disable keyword. Reauthentication on IKE rekey is disabled by default.
hostname(config-group-policy)# re-xauth {enable | disable}
hostname(config-group-policy)#
To enable inheritance of a value for reauthentication on IKE rekey from another group policy, remove
the re-xauth attribute from the running configuration by entering the no form of this command.
hostname(config-group-policy)# no re-xauth
hostname(config-group-policy)#
Note
Specify whether to restrict remote users to access only through the tunnel group, using the group-lock
Step 4
command in group-policy configuration mode.
hostname(config-group-policy)# group-lock {value tunnel-grp-name | none}
hostname(config-group-policy)# no group-lock
hostname(config-group-policy)#
The tunnel-grp-name variable specifies the name of an existing tunnel group that the security appliance
requires for the user to connect. Group-lock restricts users by checking if the group configured in the
VPN client is the same as the tunnel group to which the user is assigned. If it is not, the security appliance
prevents the user from connecting. If you do not configure group-lock, the security appliance
authenticates users without regard to the assigned group. Group locking is disabled by default.
To remove the group-lock attribute from the running configuration, enter the no form of this command.
This option allows inheritance of a value from another group policy.
To disable group-lock, enter the group-lock command with the none keyword. The none keyword sets
group-lock to a null value, thereby allowing no group-lock restriction. It also prevents inheriting a
group-lock value from a default or specified group policy
Specify whether to enable perfect forward secrecy. In IPSec negotiations, perfect forward secrecy
Step 5
ensures that each new cryptographic key is unrelated to any previous key. A group policy can inherit a
value for perfect forward secrecy from another group policy. Perfect forward secrecy is disabled by
default. To enable perfect forward secrecy, use the pfs command with the enable keyword in
group-policy configuration mode.
hostname(config-group-policy)# pfs {enable | disable}
hostname(config-group-policy)#
To disable perfect forward secrecy, enter the pfs command with the disable keyword.
To remove the perfect forward secrecy attribute from the running configuration and prevent inheriting a
value, enter the no form of this command.
hostname(config-group-policy)# no pfs
hostname(config-group-policy)#
OL-10088-01
Reauthentication fails if there is no user at the other end of the connection.
Cisco Security Appliance Command Line Configuration Guide
Group Policies
30-39