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Appendix C. Probes 165

Field Value

SMTP Port* 25

Timeout* 10

Critical Maximum Remote Service Latency

Warning Maximum Remote Service Latency

Table C-40. Network Services::Mail Transfer (SMTP) settings

C.8.5. Network Services::Ping

The Network Services::Ping probe determines if the RHN Server can ping the monitored system or a

speciﬁed IP address. It will also check the packet loss and compare the round trip 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 go 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 systems 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 external 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. So popu-

lating 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 moni-

tored 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.

Specifying another port number (which is required) will override the default port 110. This probe