ZyXEL Communications P-2602H - Manual (Page 224)

Chapter 15 Firewall Configuration
P-2602H(W)(L)-DxA User’s Guide
224
15.9 Firewall Commands
The following describes the firewall commands. See the Command Interpreter appendix for
information on the command structure. Each of these commands must be preceded by
sys
firewall when you use them. For example, type sys firewall active yes to turn on
the firewall.
Maximum
Incomplete High
This is the number of existing half-open
sessions that causes the firewall to start
deleting half-open sessions. When the
number of existing half-open sessions rises
above this number, the ZyXEL Device
deletes half-open sessions as required to
accommodate new connection requests. Do
not set Maximum Incomplete High to lower
than the current Maximum Incomplete Low
number.
100 existing half-open sessions.
The above values causes the
ZyXEL Device to start deleting
half-open sessions when the
number of existing half-open
sessions rises above 100, and to
stop deleting half-open sessions
with the number of existing half-
open sessions drops below 80.
TCP Maximum
Incomplete
This is the number of existing half-open TCP
sessions with the same destination host IP
address that causes the firewall to start
dropping half-open sessions to that same
destination host IP address. Enter a number
between 1 and 256. As a general rule, you
should choose a smaller number for a smaller
network, a slower system or limited
bandwidth.
30 existing half-open TCP
sessions.
Action taken when the TCP Maximum Incomplete reached threshold
Delete the Oldest
Half Open
Session when
New Connection
Request Comes.
Select this radio button to clear the oldest half
open session when a new connection request
comes.
Deny New
Connection
Request for
Select this radio button and specify for how
long the ZyXEL Device should block new
connection requests when TCP Maximum
Incomplete is reached.
Enter the length of blocking time in minutes
(between 1 and 256).
Apply Click Apply to save your changes back to the ZyXEL Device.
Cancel Click Cancel to begin configuring this screen afresh.
Table 83 Firewall: Threshold (continued)
LABEL DESCRIPTION DEFAULT VALUES
Table 84 Sys Firewall Commands
COMMAND DESCRIPTION
acl
disp Displays ACLs or a specific ACL set # and rule #.
active Active firewall or deactivate firewall
Enables/disables the firewall.
cnt