ZyXEL Communications 100 Series User Manual

Chapter 30 ADP

ZyWALL USG 100/200 Series User’s Guide

The following table describes the fields in this screen.  

Protocol anomaly is the third screen in an ADP profile. Protocol anomaly (PA) rules check for 
protocol compliance against the relevant RFC (Request for Comments). 

Protocol anomaly detection includes HTTP Inspection, TCP Decoder, UDP Decoder and 
ICMP Decoder where each category reflects the packet type inspected. 

Table 168   ADP > Profile > Traffic Anomaly

Name

This is the name of the ADP profile. You may use 1-31 alphanumeric characters, 
underscores(

_

), or dashes (-), but the first character cannot be a number. This 

value is case-sensitive. These are valid, unique profile names:
MyProfile
mYProfile
Mymy12_3-4
These are invalid profile names:
1mYProfile
My Profile
MyProfile?
Whatalongprofilename123456789012

Scan/Flood 
Detection 

Sensitivity

(Scan detection only.) Select a sensitivity level so as to reduce false positives in 
your network. If you choose low sensitivity, then scan thresholds and sample times 
are set low, so you will have fewer logs and false positives; however some traffic 
anomaly attacks may not be detected.
If you choose high sensitivity, then scan thresholds and sample times are set high, 
so most traffic anomaly attacks will be detected; however you will have more logs 
and false positives. 

Block Period

Specify for how many seconds the ZyWALL blocks all packets from being sent to 
the victim (destination) of a detected anomaly attack.

Name

This is the name of the traffic anomaly rule. Click the Name column heading to sort 
in ascending or descending order according to the rule name.

Activation

Click the icon to enable or disable a rule or group of rules.

Log

Select whether to have the ZyWALL generate a log (log), log and alert (log alert) or 
neither (no) when traffic matches this anomaly rule. See 

 

for more on logs.

Action

Select what the ZyWALL should do when a packet matches a rule. 
none: The ZyWALL takes no action when a packet matches the signature(s).
block: The ZyWALL silently drops packets that matches the rule. Neither sender 
nor receiver are notified.

Threshold

For flood detection you can set the number of detected flood packets per second 
that causes the ZyWALL to take the configured action.

OK

Click OK to save your settings to the ZyWALL, complete the profile and return to 
the profile summary page. 

Cancel

Click Cancel to return to the profile summary page without saving any changes.

Save

Click Save to save the configuration to the ZyWALL but remain in the same page. 
You may then go to the another profile screen (tab) in order to complete the profile. 
Click OK in the final profile screen to complete the profile.