Netgear ADSL Firewall Router DG834 User Manual download pdf (Page 53)

Reference Manual for the ADSL Firewall Router DG834

Protecting Your Network 4-9

202-10005-05, June 2005

• If the IP address of the local server computer is assigned by DHCP, it may change when the

computer is rebooted. To avoid this, use the Reserved IP address feature in the LAN IP menu

to keep the computer’s IP address constant.

• Local computers must access the local server using the computer’s local LAN address

(192.168.0.11 in the example in Figure 4-6 above). Attempts by local computers to access the

server using the external WAN IP address will fail.

Outbound Rules (Service Blocking)

The DG834 allows you to block the use of certain Internet services by computers on your network.

This is called service blocking or port filtering. You can define an outbound rule to block Internet

access from a local computer based on:

• IP address of the local computer (source address)

• IP address of the Internet site being contacted (destination address)

•Time of day

• Type of service being requested (service port number)

Following is an application example of outbound rules:

Outbound Rule Example: Blocking Instant Messenger

If you want to block Instant Messenger usage by employees during working hours, you can create

an outbound rule to block that application from any internal IP address to any external address

according to the schedule that you have created in the Schedule menu. You can also have the router

log any attempt to use Instant Messenger during that blocked period.

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Netgear ADSL Firewall Router DG834 User Manual Page 53