Several router vendors offer VPN products based on the ability of the router to perform the requisite
security functions. If your VPN is relatively small and the traffic volume not too heavy, then you
might consider this option as a cost−effective approach. You need to have compatible routers at
each location as shown in Figure 4−8. If there are individuals (for example, laptops or
telecommuters) that don't have routers, they must have software that is compatible with that
provided on the router. Make sure your vendor provides the compatible software that provides the
level of security that you require for your VPN. The absence of a firewall in Figure 4−8 may be taken
to mean that in this low−cost approach we are doing firewall functions on the router. In this case, the
network would logically appear as in Figure 4−9.