8-4
Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 8 Configuring Basic Settings
Setting the Date and Time
The
weekday
value specifies the day of the week:
Monday
,
Tuesday
,
Wednesday
, and so on.
The
month
value sets the month as a string.
The
hh:mm
value sets the hour and minutes in 24-hour time.
The
offset
value sets the number of minutes to change the time for daylight saving time. By default,
the value is 60 minutes.
Setting the Date and Time Using an NTP Server
To obtain the date and time from an NTP server, perform the following steps:
Step 1
To configure authentication with an NTP server, perform the following steps:
a.
To enable authentication, enter the following command:
hostname(config)#
ntp authenticate
b.
To specify an authentication key ID to be a trusted key, which is required for authentication with an
NTP server, enter the following command:
hostname(config)#
ntp trusted-key
key_id
Where the
key_id
is between 1 and 4294967295. You can enter multiple trusted keys for use with
multiple servers.
c.
To set a key to authenticate with an NTP server, enter the following command:
hostname(config)#
ntp authentication-key
key_id
md5
key
Where
key_id
is the ID you set in Step 1b using the
ntp trusted-key
command, and key is a string
up to 32 characters in length.
Step 2
To identify an NTP server, enter the following command:
hostname(config)#
ntp server
ip_address
[
key
key_id
] [source interface_name] [
prefer
]
Where the
key_id
is the ID you set in
Step 1b
using the
ntp trusted-key
command.
The
source
interface_name
identifies the outgoing interface for NTP packets if you do not want to use
the default interface in the routing table. Because the system does not include any interfaces in multiple
context mode, specify an interface name defined in the admin context.
The
prefer
keyword sets this NTP server as the preferred server if multiple servers have similar
accuracy. NTP uses an algorithm to determine which server is the most accurate and synchronizes to that
one. If servers are of similar accuracy, then the
prefer
keyword specifies which of those servers to use.
However, if a server is significantly more accurate than the preferred one, the security appliance uses the
more accurate one. For example, the security appliance uses a server of stratum 2 over a server of
stratum 3 that is preferred.
You can identify multiple servers; the security appliance uses the most accurate server.
Setting the Date and Time Manually
To set the date time manually, enter the following command:
Summary of Contents for 500 Series
Page 38: ...Contents xxxviii Cisco Security Appliance Command Line Configuration Guide OL 12172 03 ...
Page 45: ...P A R T 1 Getting Started and General Information ...
Page 46: ......
Page 277: ...P A R T 2 Configuring the Firewall ...
Page 278: ......
Page 561: ...P A R T 3 Configuring VPN ...
Page 562: ......
Page 891: ...P A R T 4 System Administration ...
Page 892: ......
Page 975: ...P A R T 5 Reference ...
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