Appendix A – Troubleshooting

D-Link DSL-2750U User Manual

51

DMZ Host

Since some applications are not compatible with NAT, the Router supports

use of a DMZ IP address for a single host on the LAN. This IP address is

not protected by NAT and will therefore be visible to agents on the Internet

with the right type of software. Keep in mind that any client PC in the DMZ

will be exposed to various types of security risks. If you use the DMZ, take

measures (such as client-based virus protection) to protect the remaining

client PCs on your LAN from possible contamination through the DMZ.

To designate a DMZ IP address, type in the IP Address of the server or

device on your LAN, and click the

Save/Apply

button.

Security

To access the

Security

window, click the

Security

button in the

Advanced Setup

directory. The

Security

button appears after configuring WAN

interface in PPPoA, PPPoE, IPoE or IPoA.

IP Filtering

The

IP Filtering

button appears when configuring WAN interface in PPPoA, PPPoE, IPoE or IPoA.

Appendix A – Troubleshooting

D-Link DSL-2750U User Manual

52

IP Filtering - Outgoing

This window allows you to create a filter rule of

Outgoing

.

Click

change default policy

to change the mode of policy.

Now default policy is BLOCK, it means all outgoing IP traffic from LAN is

blocked, but some IP traffic can be accepted by setting up filters.

If you are setting up the outgoing IP filtering, click the Add button.

Now default policy is ACCEPT, it means all outgoing IP traffic from LAN is

allowed, but some IP traffic can be Blocked by setting up filters.

If you are setting up the outgoing IP filtering, click the Add button.

Enter the information in the section. Explanations of parameters are

described below. Click the

Apply / Save

button to add the entry in the

Active Outbound IP Filtering table.

Appendix A – Troubleshooting

D-Link DSL-2750U User Manual

53

Filters

Parameter

Description

Filter Name

Enter a name for the new filter.

IP Version

Ipv4/Ipv6

Protocol

Select the transport protocol (Any, TCP/UDP, TCP, UDP or ICMP) that will be used for the filter rule.

Source IP

address[/prefix

length]

Enter the start IP address which you are creating the filter rule.

Source Port

(port or

port:port)

The Source Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or Inbound

Filter rule.

Destination IP

address[/prefix

length]

Enter the end IP address which you are creating the filter rule.

Destination Port

(port or

port:port)

The Destination Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or

Inbound Filter rule.

IP Filtering – Incoming

This window allows you to create a filter rule of

Incoming

.

Click

change default policy

to change the mode of policy.

Now default policy is

ACCEPT

, it means all incoming IP traffic from WAN

is accepted, but some IP traffic can be blocked by setting up filters.

If you are setting up the incoming IP filtering, click the

Add

button.

Appendix A – Troubleshooting

D-Link DSL-2750U User Manual

54

Now default policy is

BLOCK

, it means all incoming IP traffic from WAN is

blocked, but some IP traffic can be accepted by setting up filters.

If you are setting up the incoming IP filtering, click the

Add

button.

Enter the information in the section. Explanations of parameters are

described below. Click the

Apply / Save

button to add the entry in the

Active Inbound IP Filtering table.

Filters Parameter

Description

Filter Name

Enter a name for the new filter.

IP Version

Ipv4/Ipv6

Protocol

Select the transport protocol (Any, TCP/UDP, TCP, UDP or ICMP) that will be used for the filter rule.

Source IP

address[/prefix

length]

Enter the start IP address which you are creating the filter rule.

Source Port (port or

port:port)

The Source Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or

Inbound Filter rule.

Appendix A – Troubleshooting

D-Link DSL-2750U User Manual

55

Destination IP

address[/prefix

length]

Enter the end IP address which you are creating the filter rule.

Destination Port

(port or port:port)

The Destination Port is the TCP/UDP port on either the LAN or WAN depending on if you are configuring an Outbound or

Inbound Filter rule.

Parental Control

Use this window to deny access to specified MAC address.

If you are setting up the MAC address blocking, click the

Add

button.

MAC address is a specially formatted text string (xx:xx:xx:xx:xx:xx) that

uniquely identification of a device. This section will allow users to block

devices with certain MAC addresses on the LAN.

To configure for MAC address blocking, enter the username into the

Username

field, click

Browser’s MAC Address

to have MAC address of

the LAN device, or click

Other MAC Address

and enter a MAC address

manually. Tick the checkboxes for the desired individual days of the week

and enter desired

Start Blocking Time

and

End Blocking Time

.

Click the

Save/Apply

button to save the configuration