User`s guide

DSL-502G ADSL Router User’s Guide

For each rule in a set, you may define the following parameters:

Comment

Type in an appropriate identifying comment for the rule.

Pass or Block

Select Pass or Block to perform this action on packets as defined below.

Direction

Select In or Out to pass or block packets coming in or going out of the

network.

Protocol

Select IGMP, TCP, UDP or All to pass or block packets of that protocol type.

IP Address Filter Rule

Source

Type in the source IP address and select the Subnet Mask to pass or block

packets form that IP address.

Destination

Type in the destination IP address and select the Subnet Mask to pass or

block packets destined to that IP address.

Port Filter Rule

UDP and TCP packets only. Select a range of ports to pass or block.

Use the following guide to define the port or port range (Start Port and End Port):

< : specifies the port numbers less than and equal to the Start Port number

> : specifies the port numbers greater than and equal to the Start Port number

= : sets the port number equal to the Start Port if there is no End Port specified; if an End

Port number is specified, this defines a range of ports to filter. The range is defined as the

port numbers between the Start Port and End Port, including the Start and End Port

numbers.

≠ : the port number does not equal to the Start Port if there is no End Port specified; if an

End Port number is specified, this defines a range of ports not

to filter. The range is defined

as the port numbers between the Start Port and End Port, including the Start and End Port

numbers.

Filter Rule State

Select enabled or disabled to enable or disable the filter rule as defined in the

menu.

When you have defined the rule, click on OK, the Save changes and reboot system prompt will appear. You can

save and reboot now, or continue to define more filtering rules.

To clear the rules menu to show the default values, click the Clear button.

To return to the Set # menu, click the Exit icon. The comment you entered for new rule will appear next to the

rule number.