Chapter 5 Log; Overview; What You Need To Know - ZyXEL Communications PM7516 Series User Manual

5.1 Overview

The Web Configurator allows you to choose which categories of events and/or alerts to have the Zyxel
Device log and then display the logs or have the Zyxel Device send them to an administrator (as e-mail)
or to a syslog server.

5.1.1 What You Need To Know

The following terms and concepts may help as you read this chapter.
Alerts and Logs
An alert is a type of log that warrants more serious attention. They include system errors, attacks (access
control) and attempted access to blocked web sites.
Syslog Overview
The syslog protocol allows devices to send event notification messages across an IP network to syslog
servers that collect the event messages. A syslog-enabled device can generate a syslog message and
send it to a syslog server.
Syslog is defined in RFC 3164. The RFC defines the packet format, content and system log related
information of syslog messages. Each syslog message has a facility and severity level. The syslog facility
identifies a file in the syslog server. Refer to the documentation of your syslog program for details. The
following table describes the syslog severity levels.
Table 8 Syslog Severity Levels
CODE
0
1
2
3
4
5
6
7
SEVERITY
Emergency: The system is unusable.
Alert: Action must be taken immediately.
Critical: The system condition is critical.
Error: There is an error condition on the system.
Warning: There is a warning condition on the system.
Notice: There is a normal but significant condition on the system.
Informational: The syslog contains an informational message.
Debug: The message is intended for debug-level purposes.
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Log