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Page 51 / 84 Scroll up to view Page 46 - 50
51
D-Link DSL-500B User Manual
Web Configuration
Step 9
Click
Save/Apply
to apply the settings.
If the application you require is not in the list, manually enter the information.
Select the protocol for the service you are providing from the Protocol drop-down list. Under External Port, enter
the port number of the service you are providing. In the Internal Port field, enter the internal port number, to which
service requests are to be forwarded. In the Local IP Address field, enter the IP address of the PC that provides the
service.
Example
The Web server is configured to react to requests on port 8080. However, the requests from websites enter the Web
server via port 80 (standard value). If you add the PC to the forwarding table and define port 80 as the public port
and port 8080 as an internal port, all requests from the Internet are diverted to the service with port 80 on the Web
server of the PC you have defined with port 8080.
Deleting Port Forwarding
Step 1
Select the
Remove
check box.
Step 2
Click
Save/Apply
to apply the settings.
Port Triggering
If you configure port triggering for a certain application, you must determine a so-called trigger port and the protocol
(TCP or UDP) that this port uses. You then assign the public ports that are to be opened for the application to this
trigger port. You can select known Internet services or manually assign ports or port blocks.
Page 52 / 84
52
D-Link DSL-500B User Manual
Web Configuration
Adding Port Triggering
Step 1
To set up port triggering for a service, select
Advanced Settings
>
NAT
>
Port Triggering
, and click
Add
.
Step 2
Select the required application from the
Select an application
drop-down list, or manually enter the information in the
Custom
application
field.
Step 3
Trigger Port Start and Trigger Port End:
Enter the port that is to
be monitored for outgoing data traffic.
Trigger Protocol:
Select the protocol that is to be monitored for
outgoing data traffic.
Open Protocol:
Select the protocol that is to be allowed for
incoming data traffic.
Open Port Start and Open Port End:
Enter the port that is to be
opened for incoming traffic.
Step 4
Click
Save/Apply
to apply the settings.
Removing Port Triggering
Step 1
Select the
Remove
check box.
Step 2
Click
Save/Apply
to apply the settings.
Page 53 / 84
53
D-Link DSL-500B User Manual
Web Configuration
DMZ Host
The demilitarized military zone (DMZ) host feature allows one local computer to be exposed to the Internet. This
function is applicable for:
Users who want to use a special-purpose Internet service, such as an on-line game or video conferencing
±
program, that is not in the port forwarding list and for which no port range information is available.
Users who are not concerned with security and wish to expose one computer to all services without restriction.
±
Note:
A DMZ host is not protected by the firewall and may be vulnerable to attack. This may also put other
computers in the home network at risk. Hence, when designating a DMZ host, you must consider the security impli-
cations and take the appropriate precautions.
You can set up a client in your local network as a DMZ host. Your device then forwards all incoming data traffic
from the Internet to this client. You can, for example, operate your own Web server on one of the clients in your
local network and make it accessible to Internet users. As the exposed host, the local client is directly visible to
the Internet and therefore particularly vulnerable to attacks (for example, hacker attacks). Enable this function only
when necessary (for example, to operate a Web server) and when other functions (for example, port forwarding) are
inadequate. In this case, you should take appropriate measures for the clients concerned.
Note:
Only one PC per public IP address can be set up as an exposed host.
Page 54 / 84
54
D-Link DSL-500B User Manual
Web Configuration
Adding a DMZ Host
Step 1
To set up a PC as a DMZ host, select
Advanced Setup
> NAT >
DMZ Host.
Step 2
Enter the local IP address of the PC that is to be enabled as an
exposed host.
Step 3
Click
Save/Apply
to apply the settings.
Remove DMZ host
Step 1
Clear the DMZ Host Address.
Step 2
Click
Save/Apply
to apply the settings.
Page 55 / 84
55
D-Link DSL-500B User Manual
Web Configuration
Select
Advanced Setup >
Security
>
IP Filtering
. The
Outgoing
IP Filtering Setup
page will appear.
By default, the firewall is enabled. The firewall is used to block data
transmissions between the Internet and your PC. It serves as a
security gate and permits only authorized traffic to be sent to the
LAN.
Click
Add
to create an IP Filter Rule.
Security

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