Appendix C. Probes 165Field ValueSMTP Port* 25Timeout* 10Critical Maximum Remote Service LatencyWarning Maximum Remote Service LatencyTable C-40. Network Services::Mail Transfer (SMTP) settingsC.8.5. Network Services::PingThe Network Services::Ping probe determines if the RHN Server can ping the monitored system or aspecified IP address. It will also check the packet loss and compare the round trip average against theWarning and Critical threshold levels. The required Packets to send value allows you to control howmany 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 andfrom 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 thathave multiple IP addresses. For instance, if the system is configured with multiple virtual IP addressesor uses Network Address Translation (NAT) to support internal and external IP addresses, this optionmay be used to check a secondary IP address, rather than the primary address associated with thehostname.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 addressbut between the RHN Server and the IP address. Therefore, entering the same IP address for Pingprobes 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.8.7Network Services::Remote Ping.Field ValueIP Address (defaults to system IP)Packets to send* 20Timeout* 10Critical Maximum Round-Trip AverageWarning Maximum Round-Trip AverageCritical Maximum Packet LossWarning Maximum Packet LossTable C-41. Network Services::Ping settingsC.8.6. Network Services::POP MailThe 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
