Log; C Ha Pte R 15 L O G; Log Overview; What You Can Do In This Chapter - ZyXEL Communications LTE Series User Manual

15.1 L o g O ve rvie w
These screens allow you to determine the categories of events and/or alerts that the Zyxel Device logs
and then display these logs or have the Zyxel Device send them to an administrator (through email) or
to a syslog server.
15.1.1 Wha t Yo u C a n Do in this C ha pte r
• Use the
Syste m L o g
• Use the
Se c urity L o g
15.3 on page
15.1.2 Wha t Yo u Ne e d T o Kno w
The following terms and concepts may help as you read this chapter.
Ale rts a nd L o g s
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. Some categories such as
both logs and alerts. You may differentiate them by their color in the
red and logs display in black.
Syslo g O ve rvie w
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 58 Syslog Severity Levels
C O DE
0
1
2
3
4
screen to see the system logs
screen to see the security-related logs for the categories that you select
149).
SEVERIT Y
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.
LTE Series User's Guide
C
HA PTER
(Section 15.2 on page
148
1 5
L o g
149).
Syste m Erro rs
screen. Alerts display in
Vie w L o g
(Section
consist of