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Communication Security: Wireless • Chapter 4 231

VPN tunnel for access to the wired network. Some vendors, such as Colubris, offer
VPN solutions built into wireless devices.These devices act as VPN-aware clients
that forward only VPN traffic from the wireless network to the wired network, or
they can provide their own VPN server for wireless clients. However, it is not nec-
essary to use a proprietary hardware-based solution. One solution is to use freeware
known as Dolphin from www.reefedge.com that will turn a PC into an appliance
that encrypts wireless traffic with IPSec. Figure 4.21 below shows a network
topology for this level of security.

NOTE
For more information on this technology, see www.colubris.com/en/sup-
port/whitepapers.

Figure 4.21 Using a VPN for Wireless Access to Wired Network

DMZ

Corporate
Network

Wireless Network
DMZ
Laptop
Laptop
Laptop

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