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Is your wife using the Cisco VPN client software or does the linksys router establish the tunnel? If she is using the Cisco VPN client software the router should be immaterial. It only establishes the physical/network connections.

If the linksys router establishes the tunnel then the easiest (depending on the company she works for) is to have them replace it with a wireless router. Then you have everything you need. If they are not willing to do that and you have to make what you have work, then I need to know how you "connected" the two routers. Are they direct connected or connected through a switch port? Direct connections may require a different cable than what you are using. The routers have to be "aware" of each other by using the same routing protocols or by having static route(s) defined on one or both of the routers.

I cannot help you with the specific configuration tasks as I am "do" Cisco and have no experience with Linksys or Siemens.