User guide

Advanced Configuration

1553-ZAT 759 94 Uen A – October 2004

• Source/Destination Port Range;

Enter the starting and ending port numbers that identify the service that

you want to filter, e.g. web service is on port 80 and FTP on port 21.

• Direction;

From the drop-down lists, choose whether to filter the packets that are

incoming (In) or outgoing (Out) with respect to the interface. The action

can be “Allow” or “Block”.

When you have made your settings, click the Apply button. You will now

return to the Port filter list where your new port filter is displayed.

Note: To save the port filters permanently, you MUST perform a Save

Config. From the left hand menu, select Advanced Setup > Save

Config and then click the Save button.

4.4.2.2 Configuring NAT Security

Certain network games, chat or file sharing software do not work with your

default NAT setting. Your device knows the port, protocol and trigger

information needed to allow access to the common applications listed

below, but by default, access to them is disabled.

Table 5 Common Applications

Application TCP port

number

UDP port

number

Trigger

required?

E-mail 110, 25 N/A False

News 119 N/A False

MSN Messenger 1863 N/A False

Yahoo! Instant Messenger 5050

5055

5100

N/A False

AOL Instant Messenger 5190 N/A False

Internet Relay Chat (IRC) 194 194 False

1720 N/A True

N/A 1719 True

Netmeeting (h323)

1731, 522 N/A False

Real Audio 544

7070

544

6770

False