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Page 201 / 944 Scroll up to view Page 196 - 200
Chapter 9 Monitor
ZyWALL USG 50 User’s Guide
201
Click a column’s heading cell to sort the table entries by that column’s criteria.
Click the heading cell again to reverse the sort order.
Figure 144
Anti-X > Content Filter > Cache
The following table describes the labels in this screen.
Table 45
Anti-X > Content Filter > Cache
LABEL
DESCRIPTION
URL Cache
Entry
Refresh
Click this button to reload the list of content filter cache entries.
Flush
Click this button to clear all web site addresses from the cache
manually.
Remove
Select one or more URL entries and click
Delete
to remove them from
the cache.
#
This is the index number of a categorized web site address record.
Page 202 / 944
Chapter 9 Monitor
ZyWALL USG 50 User’s Guide
202
Category
This field shows whether access to the web site’s URL was blocked
or
allowed.
Click the column heading to sort the entries. Point the triangle up to
display the blocked URLs before the URLs to which access was allowed.
Point the triangle down to display the URLs to which access was allowed
before the blocked URLs.
URL
This is a web site’s address that the ZyWALL previously checked with
the external content filtering database.
Remaining Time
(minutes)
This is the number of minutes left before the URL entry is discarded
from the cache.
URL Cache
Setup
Maximum TTL
Type the maximum time to live (TTL) (1 to 720 hours). This sets how
long the ZyWALL is to keep an entry in the URL cache before discarding
it.
The external content filtering database frequently adds previously un-
categorized web sites and sometimes changes a web site’s category.
Setting this limit higher will speed up the processing of web access
requests but will also make it take longer for the ZyWALL to reflect
changes in the external content filtering database.
Apply
Click
Apply
to save your changes back to the ZyWALL.
Reset
Click
Reset
to return the screen to its last-saved settings.
Table 45
Anti-X > Content Filter > Cache (continued)
LABEL
DESCRIPTION
Page 203 / 944
Chapter 9 Monitor
ZyWALL USG 50 User’s Guide
203
9.17
The Anti-Spam Statistics Screen
Click
Monitor > Anti-X Statistics > Anti-Spam
to display the following screen.
This screen displays spam statistics.
Figure 145
Monitor > Anti-X Statistics > Anti-Spam
The following table describes the labels in this screen.
Table 46
Monitor > Anti-X Statistics > Anti-Spam
LABEL
DESCRIPTION
Collect
Statistics
Select this check box to have the ZyWALL collect anti-spam statistics.
The collection starting time displays after you click
Apply
. All of the
statistics in this screen are for the time period starting at the time
displayed here. The format is year, month, day and hour, minute, second.
All of the statistics are erased if you restart the ZyWALL or click
Flush
Data
. Collecting starts over and a new collection start time displays.
Apply
Click
Apply
to save your changes back to the ZyWALL.
Reset
Click
Reset
to return the screen to its last-saved settings.
Refresh
Click this button to update the report display.
Flush Data
Click this button to discard all of the screen’s statistics and update the
report display.
Total Mails
Scanned
This field displays the number of e-mails that the ZyWALL’s anti-spam
feature has checked.
Clear Mails
This is the number of e-mails that the ZyWALL has determined to not be
spam.
Page 204 / 944
Chapter 9 Monitor
ZyWALL USG 50 User’s Guide
204
Spam Mails
This is the number of e-mails that the ZyWALL has determined to be
spam.
Spam Mails
Detected by
Black List
This is the number of e-mails that matched an entry in the ZyWALL’s anti-
spam black list.
Spam Mails
Detected by
DNSBL
The ZyWALL can check the sender and relay IP addresses in an e-mail’s
header against DNS (Domain Name Service)-based spam Black Lists
(DNSBLs). This is the number of e-mails that had a sender or relay IP
address in the header which matched one of the DNSBLs that the ZyWALL
uses.
DSNBL
Timeout
This is how many queries that were sent to the ZyWALL’s configured list
of DNSBL domains and did not receive a response in time.
Mail Sessions
Forwarded
This is how many e-mail sessions the ZyWALL allowed because they
exceeded the maximum number of e-mail sessions that the anti-spam
feature can check at a time.
You can see the ZyWALL’s threshold of concurrent e-mail sessions in the
Anti-Spam > Status
screen.
Use the
Anti-Spam > General
screen to set whether the ZyWALL
forwards or drops sessions that exceed this threshold.
Mail Sessions
Dropped
This is how many e-mail sessions the ZyWALL dropped because they
exceeded the maximum number of e-mail sessions that the anti-spam
feature can check at a time.
You can see the ZyWALL’s threshold of concurrent e-mail sessions in the
Anti-Spam > Status
screen.
Use the
Anti-Spam > General
screen to set whether the ZyWALL
forwards or drops sessions that exceed this threshold.
Top Sender By
Use this field to list the top e-mail or IP addresses from which the ZyWALL
has detected the most spam.
Select
Sender IP
to list the source IP addresses from which the ZyWALL
has detected the most spam.
Select
Sender Email Address
to list the top e-mail addresses from
which the ZyWALL has detected the most spam.
#
This field displays the entry’s rank in the list of the top entries.
Sender IP
This column displays when you display the entries by
Sender IP
. It shows
the source IP address of spam e-mails that the ZyWALL has detected.
Sender Mail
Address
This column displays when you display the entries by
Sender Mail
Address
. This column displays the e-mail addresses from which the
ZyWALL has detected the most spam.
Occurrence
This field displays how many spam e-mails the ZyWALL detected from the
sender.
Table 46
Monitor > Anti-X Statistics > Anti-Spam (continued)
LABEL
DESCRIPTION
Page 205 / 944
Chapter 9 Monitor
ZyWALL USG 50 User’s Guide
205
9.18
The Anti-Spam Status Screen
Click
Monitor > Anti-X Statistics > Anti-Spam > Status
to display the
Anti-
Spam Status
screen.
Use the
Anti-Spam Status
screen to see how many e-mail sessions the anti-
spam feature is scanning and statistics for the DNSBLs.
Figure 146
Monitor > Anti-X Statistics > Anti-Spam > Status
The following table describes the labels in this screen.
Table 47
Monitor > Anti-X Statistics > Anti-Spam > Status
LABEL
DESCRIPTION
Refresh
Click this button to update the information displayed on this screen.
Flush
Click this button to clear the DNSBL statistics. This also clears the
concurrent mail session scanning bar’s historical high.
Concurrent Mail
Session Scanning
The darker shaded part of the bar shows how much of the ZyWALL’s
total spam checking capability is currently being used.
The lighter shaded part of the bar and the pop-up show the historical
high.
The first number to the right of the bar is how many e-mail sessions
the ZyWALL is presently checking for spam. The second number is the
maximum number of e-mail sessions that the ZyWALL can check at
once. An e-mail session is when an e-mail client and e-mail server (or
two e-mail servers) connect through the ZyWALL.
DNSBL Statistics
These are the statistics for the DNSBL the ZyWALL uses. These
statistics are for when the ZyWALL actually queries the DNSBL
servers. Matches for DNSBL responses stored in the cache do not
affect these statistics.
#
This is the entry’s index number in the list.
DNSBL Domain
These are the DNSBLs the ZyWALL uses to check sender and relay IP
addresses in e-mails.
Total Queries
This is the total number of DNS queries the ZyWALL has sent to this
DNSBL.
Avg. Response
Time (sec)
This is the average for how long it takes to receive a reply from this
DNSBL.
No Response
This is how many DNS queries the ZyWALL sent to this DNSBL without
receiving a reply.

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