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Comment: behavior of empty fields in Netwatch

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Netwatch monitors the state of hosts on the network. Monitoring can be done with the following probe types:
1) ICMP - pings to a specified IP address - hosts, with an option to adjust threshold values
2) Simple - uses ping, without use of advanced metrics
3) TCP conn, to test the TCP connection
4) HTTP GET/HTTPS GET, request against a server you are monitoring

For each entry in the Netwatch table, you can specify an IP address, ping interval, and console scripts. The main advantage of Netwatch is its ability to issue arbitrary console commands on host state changes.

Info
Since 7.4, Netwatch functionality has been expanded, prior versions only support simple ICMP probes. While upgrading to the new version, old Netwatch entries will be unchanged, reporting probe type "simple" - preserving the same functionality.
Note

Default Netwatch values are always used -  even if they were not defined by the user. Make sure to check the "status" page of the probe to see if the default thresholds are appropriate for your use case. Default threshold values can be found under the "probe options" section on this page.

Properties

Sub-menu: /tool/netwatch

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PropertyDescription
thr-tcp-conn-time (Default: 1000: 00:05...00:30)Fail threshold for tcp-connect-time, the configuration uses microseconds, if the time unit is not specified (s/m/h), log and status pages display the same value in milliseconds.

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PropertyDescription
tcp-connect-timetime taken to establish a TCP connection

HTTP:

PropertyDescription
http-status-codeHTTP response status code (200 OK, 404 Not Found, etc.). See mozilla-http-status or RFC7231

HTTPS:

PropertyDescription
http-status-codeHTTP response status code (200 OK, 404 Not Found, etc.). See mozilla-http-status or RFC7231

Logs

On each probe's OK/fail state change:

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