Red Hat NETWORK 4.0 -, Reference Manual

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Appendix C. Probes 235
average against the Warning and Critical threshold levels. The required Packets to send
value allows you to control how many ICMP ECHO packets are sent to the system. This
probe collects the following metrics:
•
Round-Trip Average — The time it takes in milliseconds for the ICMP ECHO packet to
travel to and from the monitored system.
•
Packet Loss — The percent of data lost in transit.
Although optional, the IP Address field can be instrumental in collecting metrics for sys-
tems that have multiple IP addresses. For instance, if the system is configured with multiple
virtual IP addresses or uses Network Address Translation (NAT) to support internal and ex-
ternal IP addresses, this option may be used to check a secondary IP address rather than
the primary address associated with the hostname.
Note that this probe conducts the
ping
from an RHN Server and not the monitored system.
Populating the IP Address field does not test connectivity between the system and the
specified IP address but between the RHN Server and the IP address. Therefore, entering
the same IP address for Ping probes on different systems accomplishes precisely the same
task. To conduct a
ping
from a monitored system to an individual IP address, use the
Remote Ping probe instead. Refer to Section C.8.7 Network Services::Remote Ping .
Field Value
IP Address (defaults to system IP)
Packets to send*
20
Timeout* 10
Critical Maximum Round-Trip Average
Warning Maximum Round-Trip Average
Critical Maximum Packet Loss
Warning Maximum Packet Loss
Table C-41. Network Services::Ping settings
C.8.6. Network Services::POP Mail
The Network Services::POP Mail probe determines if it can connect to the POP3 port on
the system. A port number must be specified; specifying another port number overrides the
default port 110. This probe collects the following metric: