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Security, Port Triggering, Add Port Triggering Rule, Inbound Rules Port, Forwarding

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DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual was made. When the application ceases to transmit data over the port, the router waits for a timeout interval and then closes the port or range of ports, making them available to other computers on the private network. Once configured, the operation is as follows: • A PC makes an outgoing connection using a port number defined in the Outgoing Port Triggering table. • The ProSafe DGFV338 records this connection, opens the incoming port or ports associated with this entry in the Incoming Port Triggering table, and associates them with the PC. • The remote system receives the PCs request and responds using the different port numbers that you have now opened. • This Router matches the response to the previous request, and forwards the response to the PC. • Without Port Triggering, this response would be treated as a new connection request rather than a response. As such, it would be handled in accordance with the Port Forwarding rules. • Only one PC can use a Port Triggering application at any time. • After a PC has finished using a Port Triggering application, there is a Time-out period before the application can be used by another PC. This is required because this Router cannot be sure when the application has terminated. Note: For additional ways of allowing inbound traffic, see "Inbound Rules (Port Forwarding)" on page 4-7. To add a new port triggering rule: 1. Select Security from the main menu and Port Triggering from the submenu. The Port Triggering screen will display. 2. Enter the following data in the Add Port Triggering Rule fields: a. Name - Enter a suitable name for this rule (for example, the name of the application) b. Enable/Disable - Select the desired option from the pull-down menu. c. Outgoing (Trigger) Port Range - Enter the range of port numbers used by the application on the private network when it generates an outgoing request. d. Incoming (Response) Port Range - Enter the range of port numbers used by the remote system when it responds to the PC's request. Security and Firewall Protection v1.0, April 2007 4-29

Section	Page
DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual	1
Contents	11
About This Manual	17
Conventions, Format and Scope	17
How to Use This Manual	18
How to Print this Manual	18
Chapter 1 Introduction	21
Key Features of the NETGEAR ProSafe DGFV338	21
Full Routing on Both the ADSL and 10/100 WAN Port	22
A Powerful, True Firewall with Content Filtering	22
Security	23
Virtual Private Networking (VPN)	23
Autosensing Ethernet Connections with Auto Uplink	23
Extensive Protocol Support	24
Easy Installation and Management	24
Maintenance and Support	25
System Requirements	25
Package Contents	26
Hardware Description	26
Router Front Panel	26
Router Rear Panel	28
Router Login Factory Defaults	29
Placement of your NETGEAR ProSafe DGFV338	30
Chapter 2 Basic Installation and Configuration	31
Using ADSL Microfilters (optional)	32
Logging in and Configuring your Internet Connection	33
Configuring Your Internet Connection using Auto Detect	34
Manually Configuring your ADSL Connection	36
Manually Configuring your Ethernet Connection	38
Selecting Advanced Options for your Ethernet or ADSL Connection	40
Configuring the WAN Mode	44
Configuring Dynamic DNS (If Needed)	47
Programming the Traffic Meter	50
Chapter 3 Wireless Configuration	53
Implementing Wireless Security	53
Understanding Wireless Settings	55
Wireless LANs	56
Access Control List	58
Wireless Advanced Options	59
Advanced Wireless Router Settings	59
WEP and WPA/WPA2 Wireless Security Check List Form	60
Configuring Your Wireless Settings	61
Configuring WEP	62
Configuring WPA-PSK	64
Configuring WPA2-PSK	65
Configuring WPA-PSK and WPA2-PSK	66
Configuring WPA with RADIUS	67
Configuring WPA2 with RADIUS	68
Configuring WPA and WPA2 with RADIUS	69
Restricting Wireless Access by MAC Address	70
Chapter 4 Security and Firewall Protection	73
Firewall Protection and Content Filtering Overview	73
Using Rules to Block or Allow Specific Kinds of Traffic	73
About Service Based Rules	74
Outbound Rules (Service Blocking)	75
The DGFV338 allows you to block the use of certain Internet services by PCs on your network. This is called service blocking or port filtering.	75
Outbound Rule Example: Blocking Instant Messenger	79
Inbound Rules (Port Forwarding)	79
Because the DGFV338 uses Network Address Translation (NAT), your network presents only one IP address to the Internet and outsid...	79
Inbound Rule Example: A Local Public Web Server	84
Inbound Rule Example: Allowing Videoconference from Restricted Addresses	84
Inbound Rule Example: One-to-One NAT Mapping	85
Inbound Rule Example: Exposed Host	87
Considerations for Inbound Rules	88
Order of Precedence for Rules	89
Customized Services	89
Quality of Service (QoS) Priorities	91
Attack Checks	92
Managing Groups and Hosts	93
Blocking Internet Sites	96
Enabling Source MAC Filtering	99
Setting up Port Triggering	100
Setting a Schedule to Block or Allow Specific Traffic	103
Event Logs and Alerts	104
Security and Administrator Management	107
Chapter 5 Virtual Private Networking	109
Dual WAN Port Systems	109
Setting up a VPN Connection using the VPN Wizard	110
VPN Tunnel Policies	113
IKE Policy	113
Managing IKE Policies	114
IKE Policy Table	114
VPN Policy	115
Managing VPN Policies	115
VPN Policy Table	116
VPN Tunnel Connection Status	116
Creating a VPN Connection: Between FVX538 and DGFV338	117
Configuring the ProSafe DGFV338	117
Configuring the FVX538	122
Testing the Connection	123
Creating a VPN Client Connection: VPN Client to DGFV338	123
Configuring the DGFV338	123
Configuring the VPN Client	125
Testing the Connection	129
Certificate Authorities	130
Generating a Self Certificate Request	131
Uploading a Trusted Certificate	133
Managing your Certificate Revocation List (CRL)	133
Extended Authentication (XAUTH) Configuration	134
Configuring XAUTH for VPN Clients	135
User Database Configuration	137
RADIUS Client Configuration	138
Manually Assigning IP Addresses to Remote Users (ModeConfig)	140
Mode Config Operation	140
Configuring the ProSafe DGFV338	141
Configuring the ProSafe VPN Client for ModeConfig	144
Chapter 6 Router and Network Management	149
Performance Management	149
Wireless Firewall Features That Reduce Traffic	149
Service Blocking	150
Block Sites	151
Source MAC Filtering	152
Wireless Firewall Features That Increase Traffic	152
Port Forwarding	152
Port Triggering	154
VPN Tunnels	154
Using QoS to Shift the Traffic Mix	154
Tools for Traffic Management	155
Administrator and Guest Access Authorization	155
Changing the Passwords and Login Time-out	155
Enabling Remote Management Access	156
Command Line Interface	158
Event Alerts	159
Traffic Limits Reached	159
Monitoring	160
Router Status	160
WAN Ports	162
Internet Traffic	163
LAN Ports and Attached Devices	165
Known PCs and Devices	165
DHCP Log	166
Port Triggering Status	167
Firewall Security	167
VPN Tunnels	169
Using a SNMP Manager	170
Diagnostics	172
Configuration File Management	174
Settings Backup and Firmware Upgrade	174
Backup and Restore Settings	174
Router Upgrade	176
Setting the Time Zone	177
Chapter 7 LAN Configuration	179
Using the Firewall as a DHCP server	179
Configuring the LAN Setup Options	180
Using Address Reservation	181
Configuring Multi Home LAN IPs	182
Configuring Static Routes	185
Adding or Editing a Static Route	185
Routing Information Protocol (RIP)	186
Static Route Example	188
Enabling Universal Plug and Play (UPnP)	188
Chapter 8 Troubleshooting	191
Basic Functions	191
Power LED Not On	191
LEDs Never Turn Off	192
LAN or Internet Port LEDs Not On	192
Troubleshooting the Web Configuration Interface	192
Troubleshooting the ISP Connection	193
Troubleshooting a TCP/IP Network Using a Ping Utility	195
Testing the LAN Path to Your Firewall	195
Testing the Path from Your PC to a Remote Device	196
Restoring the Default Configuration and Password	197
Problems with Date and Time	197
Appendix A Default Settings and Technical Specifications	199
Default Factory Settings	199
Technical Specifications	201
Appendix B Related Documents	203

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DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual

Security and Firewall Protection

4-29

v1.0, April 2007

was made. When the application ceases to transmit data over the port, the router waits for a

timeout interval and then closes the port or range of ports, making them available to other

computers on the private network.

Once configured, the operation is as follows:

•

A PC makes an outgoing connection using a port number defined in the Outgoing Port

Triggering table.

•

The ProSafe DGFV338 records this connection, opens the incoming port or ports associated

with this entry in the Incoming Port Triggering table, and associates them with the PC.

•

The remote system receives the PCs request and responds using the different port numbers that

you have now opened.

•

This Router matches the response to the previous request, and forwards the response to the PC.

•

Without Port Triggering, this response would be treated as a new connection request rather

than a response. As such, it would be handled in accordance with the Port Forwarding rules.

•

Only one PC can use a Port Triggering application at any time.

•

After a PC has finished using a Port Triggering application, there is a Time-out period before

the application can be used by another PC. This is required because this Router cannot be sure

when the application has terminated.

To add a new port triggering rule:

Select

Security

from the main menu and

Port Triggering

from the submenu. The Port

Triggering screen will display.

Enter the following data in the

Add Port Triggering Rule

fields:

Name – Enter a suitable name for this rule (for example, the name of the application)

Enable/Disable – Select the desired option from the pull-down menu.

Outgoing (Trigger) Port Range – Enter the range of port numbers used by the application

on the private network when it generates an outgoing request.

Incoming (Response) Port Range – Enter the range of port numbers used by the remote

system when it responds to the PC’s request.

Note:

For additional ways of allowing inbound traffic, see

“Inbound Rules (Port

Forwarding)” on page 4-7