The system clock can be adjusted by choosing Configuration > Features > Device Administration > Administration > Clock, as shown in Figure 18-15. Select the appropriate time zone from the drop-down menu and adjust the system date by browsing through the monthly calendar. The system time can be adjusted by entering the time in the 24-hour format. In Figure 18-15, the system time is being adjusted to 5:05:05 a.m. on August 5, 2005 in the Eastern time zone. Click Apply to adjust the system clock.
Figure 18-15. Adjusting the System Clock
Example 18-6 displays the CLI commands to adjust the system clock that ASDM sends to the security Cisco ASA.
Example 18-6. Adjusting the System Clock via the CLI
clock timezone EST -5 0 clock summer-time EDT recurring 1 Sun Apr 2:00 last Sun Oct 2:00 60 clock set 5:5:5 AUG 5 2005
The system clock can be dynamically adjusted if an NTP server is specified on Cisco ASA. Set up an NTP server by choosing Configuration > Features > Device Administration > Administration > NTP. Click Add to enter a new NTP server and specify the IP address and the source interface information, as shown in Figure 18-16. If NTP authentication is being used, specify the authentication key and the key value. In this figure, a preferred NTP server located at 192.168.10.50 toward the inside interface is defined with an authentication key number of 1 and a key value of csco.
Figure 18-16. Specifying an NTP Server
Example 18-7 shows the CLI commands that ASDM sends to the security Cisco ASA.
Example 18-7. Specifying an NTP Server via the CLI
ntp server 192.168.10.50 key 1 source inside prefer ntp authenticate ntp authentication-key 1 md5 csco
Part I: Product Overview
Introduction to Network Security
Product History
Hardware Overview
Part II: Firewall Solution
Initial Setup and System Maintenance
Network Access Control
IP Routing
Authentication, Authorization, and Accounting (AAA)
Application Inspection
Security Contexts
Transparent Firewalls
Failover and Redundancy
Quality of Service
Part III: Intrusion Prevention System (IPS) Solution
Intrusion Prevention System Integration
Configuring and Troubleshooting Cisco IPS Software via CLI
Part IV: Virtual Private Network (VPN) Solution
Site-to-Site IPSec VPNs
Remote Access VPN
Public Key Infrastructure (PKI)
Part V: Adaptive Security Device Manager
Introduction to ASDM
Firewall Management Using ASDM
IPS Management Using ASDM
VPN Management Using ASDM
Case Studies