Enabling Icmp Echo Requests - Novell ZENWORKS NETWORK ACCESS CONTROL 5.0 - 09-22-2008 User Manual

Section 16.21.2, "Changing the Community Name for SNMPD," on page 375
Section 16.21.3, "SNMP MIBs," on page 376

16.21.1 Enabling ICMP Echo Requests

The default configuration for Novell ZENworks Network Access Control is to not respond to ICMP
Echo (ping) requests.
The following sections contain more information:
"Enable Temporary Ping" on page 374
"Enable Persistent Ping" on page 374
"Restricting the ICMP Request" on page 375
Enable Temporary Ping
To temporarily (until reboot) enable ICMP echo requests:
Command line
1 Log in to the Novell ZENworks Network Access Control server as root using SSH or directly
with a keyboard.
2 Enter the following command at the command line:
echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all
Pings will again be disabled after the next reboot.
Enable Persistent Ping
To persistently enable ICMP echo requests:
Command line
1 Log in to the Novell ZENworks Network Access Control server as root using SSH or directly
with a keyboard.
2 Open the rc.local file with a text editor such as vi. For example:
/etc/rc.d/rc.local
3 In the # Ignore All ICMP requests area, change the following line:
echo 1 > /proc/sys/net/ipv4/icmp_echo_ignore_all
To:
echo 0 > /proc/sys/net/ipv4/icmp_echo_ignore_all
4 Save and exit the file.
5 At the command line, enter the following:
/etc/rc.d/rc.local
374 Novell ZENworks Network Access Control Users Guide