Chapter 14 IPSec VPN
ZyWALL 2WG User’s Guide
345
Figure 219
VPN Topologies
Hub-and-spoke VPN reduces the number of VPN connections that you have to set up and
maintain in the network. Small office or telecommuter IPSec routers that support a limited
number of VPN tunnels are also able to use VPN to connect to more networks. Hub-and-spoke
VPN makes it easier for the hub router to manage the traffic between the spoke routers. If you
have the spoke routers access the Internet through the hub-and-spoke VPN tunnel, the hub
router can also provide content filtering, IDP, anti-spam and anti-virus protection for the spoke
routers.
You should not use a hub-and-spoke VPN in every situation, however. The hub router is a
single point of failure, so a hub-and-spoke VPN may not be appropriate if the connection
between the spoke routers cannot be down occasionally (for maintenance, for example). In
addition, there is a significant burden on the hub router. It receives VPN traffic from one
spoke, decrypts it, inspects it to find out where to send it, encrypts it, and sends it to the
appropriate spoke. Therefore, a hub-and-spoke VPN is more suitable when there is a minimum
amount of traffic between spoke routers.
14.20.1 Hub-and-spoke VPN Example
The following figure shows a basic hub-and-spoke VPN. Branch office A uses one VPN rule
to access both the headquarters (HQ) network and branch office B’s network. Branch office B
uses one VPN rule to access both the headquarters and branch office A’s networks.
Summary of Contents for ZYWALL 2 WG
Page 2: ......
Page 8: ...Safety Warnings ZyWALL 2WG User s Guide 8 ...
Page 42: ...List of Figures ZyWALL 2WG User s Guide 42 ...
Page 50: ...List of Tables ZyWALL 2WG User s Guide 50 ...
Page 52: ...52 ...
Page 80: ...Chapter 2 Introducing the Web Configurator ZyWALL 2WG User s Guide 80 ...
Page 100: ...Chapter 3 Wizard Setup ZyWALL 2WG User s Guide 100 ...
Page 140: ...Chapter 4 Tutorial ZyWALL 2WG User s Guide 140 ...
Page 146: ...146 ...
Page 158: ...Chapter 6 LAN Screens ZyWALL 2WG User s Guide 158 ...
Page 171: ...Chapter 8 WAN Screens ZyWALL 2WG User s Guide 171 Figure 108 NETWORK WAN General ...
Page 200: ...Chapter 8 WAN Screens ZyWALL 2WG User s Guide 200 ...
Page 238: ...238 ...
Page 300: ...Chapter 13 Content Filtering Reports ZyWALL 2WG User s Guide 300 ...
Page 348: ...Chapter 14 IPSec VPN ZyWALL 2WG User s Guide 348 ...
Page 378: ...Chapter 15 Certificates ZyWALL 2WG User s Guide 378 ...
Page 384: ...384 ...
Page 426: ...Chapter 20 Bandwidth Management ZyWALL 2WG User s Guide 426 ...
Page 479: ...479 PART V Logs and Maintenance Logs Screens 481 Maintenance 511 ...
Page 480: ...480 ...
Page 485: ...Chapter 26 Logs Screens ZyWALL 2WG User s Guide 485 Figure 304 LOGS Log Settings ...
Page 510: ...Chapter 26 Logs Screens ZyWALL 2WG User s Guide 510 ...
Page 530: ...530 ...
Page 558: ...Chapter 30 WAN and Dial Backup Setup ZyWALL 2WG User s Guide 558 ...
Page 564: ...Chapter 31 LAN Setup ZyWALL 2WG User s Guide 564 ...
Page 570: ...Chapter 32 Internet Access ZyWALL 2WG User s Guide 570 ...
Page 574: ...Chapter 33 DMZ Setup ZyWALL 2WG User s Guide 574 ...
Page 578: ...Chapter 34 Route Setup ZyWALL 2WG User s Guide 578 ...
Page 582: ...Chapter 35 Wireless Setup ZyWALL 2WG User s Guide 582 ...
Page 594: ...Chapter 37 IP Static Route Setup ZyWALL 2WG User s Guide 594 ...
Page 614: ...Chapter 38 Network Address Translation NAT ZyWALL 2WG User s Guide 614 ...
Page 632: ...Chapter 40 Filter Configuration ZyWALL 2WG User s Guide 632 ...
Page 668: ...Chapter 44 System Maintenance Menus 8 to 10 ZyWALL 2WG User s Guide 668 ...
Page 672: ...Chapter 45 Remote Management ZyWALL 2WG User s Guide 672 ...
Page 680: ...Chapter 46 IP Policy Routing ZyWALL 2WG User s Guide 680 ...
Page 686: ...686 ...
Page 692: ...Chapter 48 Troubleshooting ZyWALL 2WG User s Guide 692 ...
Page 702: ...Chapter 49 Product Specifications ZyWALL 2WG User s Guide 702 ...
Page 704: ...704 ...
Page 712: ...Appendix A Pop up Windows JavaScripts and Java Permissions ZyWALL 2WG User s Guide 712 ...
Page 740: ...Appendix D Common Services ZyWALL 2WG User s Guide 740 ...
Page 768: ...Appendix G Legal Information ZyWALL 2WG User s Guide 768 ...
Page 774: ...Appendix H Customer Support ZyWALL 2WG User s Guide 774 ...