ZyXEL Communications P-870HW-I User Manual

P-870HW-I1 User’s Guide

Chapter 30 Filter Setup

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Let’s look at an example to block outside users from accessing the ZyXEL Device via telnet. 

Table 140   Generic Filter Rule Menu Fields

Filter #

This is the filter set, filter rule coordinates, i.e., 2,3 refers to the 

second filter set and the third rule of that set.

Filter Type

Use [SPACE BAR] and then [ENTER] to select a rule type. 

Parameters displayed below each type will be different. TCP/IP filter 

rules are used to filter IP packets while generic filter rules allow 

filtering of non-IP packets.

Generic Filter 

Rule
TCP/IP Filter 

Rule

Active

Select Yes to turn on the filter rule or No to turn it off.

Yes / No

Offset

Enter the starting byte of the data portion in the packet that you wish 

to compare. The range for this field is from 0 to 255.

0-255

Length

Enter the byte count of the data portion in the packet that you wish 

to compare. The range for this field is 0 to 8. 

0-8

Mask

Enter the mask (in Hexadecimal notation) to apply to the data 

portion before comparison.

Value

Enter the value (in Hexadecimal notation) to compare with the data 

portion.

More

If Yes, a matching packet is passed to the next filter rule before an 

action is taken; else the packet is disposed of according to the 

action fields.
If More is Yes, then Action Matched and Action Not Matched will be 

No.

Yes
No

Log

Select the logging option from the following:
None - No packets will be logged.
Action Matched - Only packets that match the rule parameters will 

be logged.
Action Not Matched - Only packets that do not match the rule 

parameters will be logged.
Both – All packets will be logged.

None
Action Matched
Action Not 

Matched
Both

Action 

Matched

Select the action for a packet matching the rule.

Check Next Rule
Forward
Drop

Action Not 

Matched

Select the action for a packet not matching the rule.

Check Next Rule
Forward
Drop