ZyXEL VoIP Router Prestige 2602R-61 91-006-024004 Manual Do Utilizador

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 

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.