Chapter 9. VPN
This chapter describes the Virtual Private Network (VPN) functionality in NetDefendOS.
• Overview, page 415
• VPN Quick Start, page 419
• IPsec Components, page 429
• IPsec Tunnels, page 444
• PPTP/L2TP, page 463
• SSL VPN, page 472
• CA Server Access, page 480
• VPN Troubleshooting, page 483
9.1. Overview
9.1.1. VPN Usage
The Internet is increasingly used as a means to connect together computers since it offers efficient
and inexpensive communication. The requirement therefore exists for data to traverse the Internet to
its intended recipient without another party being able to read or alter it.
It is equally important that the recipient can verify that no one is falsifying data, in other words,
pretending to be someone else. Virtual Private Networks (VPNs) meet this need, providing a highly
cost effective means of establishing secure links between two co-operating computers so that data
can be exchanged in a secure manner.
VPN allows the setting up of a tunnel between two devices known as tunnel endpoints. All data
flowing through the tunnel is then secure. The mechanism that provides tunnel security is
encryption.
There are two common scenarios where VPN is used:
1.
LAN to LAN connection - Where two internal networks need to be connected together over
the Internet. In this case, each network is protected by an individual NetDefend Firewall and
the VPN tunnel is set up between them.
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Summary of Contents for NetDefend DFL-1660
Page 28: ...1 3 NetDefendOS State Engine Packet Flow Chapter 1 NetDefendOS Overview 28 ...
Page 88: ...2 6 3 Restore to Factory Defaults Chapter 2 Management and Maintenance 88 ...
Page 166: ...3 10 DNS Chapter 3 Fundamentals 166 ...
Page 254: ...4 7 5 Advanced Settings for Transparent Mode Chapter 4 Routing 254 ...
Page 268: ...5 4 IP Pools Chapter 5 DHCP Services 268 ...
Page 368: ...6 7 Blacklisting Hosts and Networks Chapter 6 Security Mechanisms 368 ...
Page 390: ...7 4 7 SAT and FwdFast Rules Chapter 7 Address Translation 390 ...
Page 414: ...8 3 Customizing Authentication HTML Pages Chapter 8 User Authentication 414 ...
Page 490: ...9 8 6 Specific Symptoms Chapter 9 VPN 490 ...
Page 528: ...10 4 6 Setting Up SLB_SAT Rules Chapter 10 Traffic Management 528 ...
Page 544: ...11 7 HA Advanced Settings Chapter 11 High Availability 544 ...
Page 551: ...12 3 5 Limitations Chapter 12 ZoneDefense 551 ...
Page 574: ...Default 512 13 9 Miscellaneous Settings Chapter 13 Advanced Settings 574 ...
Page 575: ...13 9 Miscellaneous Settings Chapter 13 Advanced Settings 575 ...