ZyXEL Communications ZYWALL USG 2000 Manual page 772

Chapter 47 Logs
go to the Log Settings Summary screen (see Section 47.4.1 on page 765), and
click the Active Log Summary button.
Figure 512 Active Log Summary
This screen provides a different view and a different way of indicating which
messages are included in each log and each alert. Please see Section 47.4.2 on
page 766, where this process is discussed. (The Default category includes
debugging messages generated by open source software.)
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ZyWALL USG 2000 User's Guide