ZyXEL Communications P-660HW-DX, User Manual

Page: 174 / 364

Chapter 10 Firewall Configuration
P-660HW-Dx User’s Guide
174
Figure 97 Firewall: Threshold
The following table describes the labels in this screen.
Table 63 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 ZyXEL Device 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 ZyXEL Device deletes half-open sessions
as required to accommodate new connection
attempts.
100 half-open sessions per
minute. The above numbers cause
the ZyXEL Device 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 ZyXEL
Device 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.