ZyXEL Communications AMG1302-T11C, Руководство пользователя

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Chapter 15 Firewall
AMG1302-T11C User’s Guide
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Figure 90
Security > Firewall > DoS > Advanced
The following table describes the labels in this screen.
15.6 Firewall Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
15.6.1 Firewall Rules Overview
Your customized rules take precedence and override the AMG1302-T11C’s default settings. The
AMG1302-T11C checks the source IP address, destination IP address and IP protocol type of
Table 68
Security > Firewall > DoS > Advanced
LABEL DESCRIPTION
TCP SYN-Request
Count This is the rate of new TCP half-open sessions per second that causes the firewall to
start deleting half-open sessions. When the rate of new connection attempts rises
above this number, the AMG1302-T11C deletes half-open sessions as required to
accommodate new connection attempts.
UDP Packet Count This is the rate of new UDP half-open sessions per second that causes the firewall to
start deleting half-open sessions. When the rate of new connection attempts rises
above this number, the AMG1302-T11C deletes half-open sessions as required to
accommodate new connection attempts.
ICMP Echo-Request
Count This is the rate of new ICMP Echo-Request half-open sessions per second that causes
the firewall to start deleting half-open sessions. When the rate of new connection
attempts rises above this number, the AMG1302-T11C deletes half-open sessions as
required to accommodate new connection attempts.
ICMP Redirect Select to enable or disable ICMP Redirect Protection.
An ICMP redirect message is a way to change the existing routing path. Generally,
ICMP redirect packets should not be sent, and so when there is the occurrence that
ICMP redirect packets are sent, it is important to note that it is very likely to be used
as a means for a network attack.
DoS Log Select to determines if a log is created or not when the AMG1302-T11C drops
sessions that surpass maximum thresholds.
OK Click this to save your changes.
Cancel Click this to exit this screen without saving.