Cisco RV042 Administration Guide - Page 173

Configuring a Gateway-to-Gateway VPN Tunnel Between RV0xx Series Routers Other Design Considerations D Other Design Considerations Before you configure your VPN tunnels, consider the following points about your network setup. WAN Setup The WAN setup pertains to the network that your router connects to outside your office. The first consideration is the type of IP addresses that you received for your Internet service at your two sites. As when constructing a physical tunnel or bridge, you need to know where the VPN tunnel is going. • If at least one site has a static IP address: A VPN tunnel easily can be established if at least one of the sites has a static IP address for the WAN connection. A static IP address is a publicly routable Internet address that does not change. In this scenario, establishing a VPN tunnel can be compared to building a bridge between two docks (two sites with static IP addresses), or even setting a gangplank between a dock and an unanchored boat (one site with a static IP address and one with a dynamic IP address). Figure 3 Gateway To Gateway Tunnel with Static IP Addresses Outside Site A 209.165.200.226/24 RV016 router Inside 192.168.1.1/24 Internet Outside 209.165.200.236/24 RV042 router Inside 192.168.2.1/24 Site B Printer Personal computers Personal computers Printer 199468 • If both sites have dynamic IP addresses: A dynamic IP address is a publicly routable IP address that is issued for your use when you connect to your service provider's network. Dynamic IP addresses may change without warning. In this scenario, establishing a VPN tunnel is like trying to build a bridge between two unanchored boats. However, you can "anchor" Cisco Small Business RV0xx Series Routers Administration Guide 173