ZyXEL Communications Prestige 2602R Series, User Manual

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Prestige 2602R Series User’s Guide
168 Chapter 13 Firewall Configuration
The Prestige also sends alerts whenever TCP Maximum Incomplete is exceeded. The global
values specified for the threshold and timeout apply to all TCP connections.
Click Firewall , and Threshold to bring up the next screen.
Figure 69 Firewall: Threshold
The following table describes the labels in this screen.
Table 49 Firewall: Threshold
LABEL DESCRIPTION DEFAULT VALUES
Denial of Service
Thresholds
One Minute Low This is the rate of new half-open sessions that
causes the firewall to stop deleting half-open
sessions. The Prestige continues to delete
half-open sessions as necessary, until the
rate of new connection attempts drops below
this number.
80 existing half-open sessions.
One Minute High This is the rate of new half-open sessions that
causes the firewall to start deleting half-open
sessions. When the rate of new connection
attempts rises above this number, the
Prestige deletes half-open sessions as
required to accommodate new connection
attempts.
100 half-open sessions per minute.
The above numbers cause the
Prestige to start deleting half-open
sessions when more than 100
session establishment attempts
have been detected in the last
minute, and to stop deleting half-
open sessions when fewer than 80
session establishment attempts
have been detected in the last
minute.
Maximum
Incomplete Low
This is the number of existing half-open
sessions that causes the firewall to stop
deleting half-open sessions. The Prestige
continues to delete half-open requests as
necessary, until the number of existing half-
open sessions drops below this number.
80 existing half-open sessions.