Cisco ASA 5505 - Manual (Page 1473)

67-47
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 67 Configuring Connection Profiles, Group Policies, and Users
Group Policies
Step 2 Specify whether to enable IP compression, which is disabled by default.
Note IP compression is not supported for IPsec IKEv2 connections.
hostname(config-group-policy)# ip-comp {enable | disable}
hostname(config-group-policy)#
To enable LZS IP compression, enter the ip-comp command with the enable keyword in group-policy
configuration mode. To disable IP compression, enter the ip-comp command with the disable keyword.
To remove the ip-comp attribute from the running configuration, enter the no form of this command.
This enables inheritance of a value from another group policy.
hostname(config-group-policy)# no ip-comp
hostname(config-group-policy)#
Enabling data compression might speed up data transmission rates for remote dial-in users connecting
with modems.
Caution Data compression increases the memory requirement and CPU usage for each user session and
consequently decreases the overall throughput of the ASA. For this reason, we recommend that you
enable data compression only for remote users connecting with a modem. Design a group policy specific
to modem users, and enable compression only for them.
Step 3 Specify whether to require that users reauthenticate on IKE re-key by using the re-xauth command with
the enable keyword in group-policy configuration mode.
Note IKE re-key is not supported for IKEv2 connections.
If you enable reauthentication on IKE re-key, the ASA prompts the user to enter a username and
password during initial Phase 1 IKE negotiation and also prompts for user authentication whenever an
IKE re-key occurs. Reauthentication provides additional security.
If the configured re-key interval is very short, users might find the repeated authorization requests
inconvenient. To avoid repeated authorization requests, disable reauthentication. To check the
configured re-key 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 re-key, enter the disable keyword. Reauthentication on IKE re-key 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 re-key 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 Reauthentication fails if there is no user at the other end of the connection.
Step 4 Specify whether to restrict remote users to access only through the connection profile, using the
group-lock command in group-policy configuration mode.