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Cisco Intrusion Prevention System CLI Sensor Configuration Guide for IPS 7.1
OL-19892-01
Chapter 3 Initializing the Sensor
Basic Sensor Setup
Note For example, 10.0.0.0/8 permits all IP addresses on the 10.0.0.0 network
(10.0.0.0-10.255.255.255) and 10.1.1.0/24 permits only the IP addresses on the 10.1.1.0
subnet (10.1.1.0-10.1.1.255). If you want to permit access to a single IP address than the
entire network, use a 32-bit netmask. For example, 10.1.1.1/32 permits just the 10.1.1.1
address.
c. Repeat Step b until you have added all networks that you want to add to the access list, and then
press Enter at a blank permit line to go to the next step.
Step 7 You must configure a DNS server or an HTTP proxy server for global correlation to operate:
a. Enter yes to add a DNS server, and then enter the DNS server IP address.
b. Enter yes to add an HTTP proxy server, and then enter the HTTP proxy server IP address and port
number.
Caution You must have a valid sensor license for global correlation features to function. You can still configure
and display statistics for the global correlation features, but the global correlation databases are cleared
and no updates are attempted. Once you install a valid license, the global correlation features are
reactivated.
Step 8 Enter yes to modify the system clock settings:
a. Enter yes to modify summertime settings.
Note Summertime is also known as DST. If your location does not use Summertime, go to Step m.
b. Enter yes to choose the USA summertime defaults, or enter no and choose recurring, date, or disable
to specify how you want to configure summertime settings. The default is recurring.
c. If you chose recurring, specify the month you want to start summertime settings. Valid entries are
january, february, march, april, may, june, july, august, september, october, november, and
december. The default is march.
d. Specify the week you want to start summertime settings. Valid entries are first, second, third, fourth,
fifth, and last. The default is second.
e. Specify the day you want to start summertime settings. Valid entries are sunday, monday, tuesday,
wednesday, thursday, friday, and saturday. The default is sunday.
f. Specify the time you want to start summertime settings. The default is 02:00:00.
Note The default recurring summertime parameters are correct for time zones in the United States.
The default values specify a start time of 2:00 a.m. on the second Sunday in March, and a
stop time of 2:00 a.m. on the first Sunday in November. The default summertime offset is 60
minutes.
g. Specify the month you want summertime settings to end. Valid entries are january, february, march,
april, may, june, july, august, september, october, november, and december. The default is november.
h. Specify the week you want the summertime settings to end. Valid entries are first, second, third,
fourth, fifth, and last. The default is first.