ZyXEL UAG4100 User Guide - Page 203

CHAPTER 12 Policy and Static Routes 12.1 Policy and Static Routes Overview Use policy routes and static routes to override the UAG's default routing behavior in order to send packets through the appropriate interface. For example, the next figure shows a computer (A) connected to the UAG's LAN interface. The UAG routes most traffic from A to the Internet through the UAG's default gateway (R1). You create one policy route to connect to services offered by your ISP behind router R2. You create another policy route to communicate with a separate network behind another router (R3) connected to the LAN. Figure 133 Example of Policy Routing Topology A R1 LAN WAN R3 R2 12.1.1 What You Can Do in this Chapter • Use the Policy Route screens (see Section 12.2 on page 205) to list and configure policy routes. • Use the Static Route screens (see Section 12.3 on page 211) to list and configure static routes. 12.1.2 What You Need to Know Policy Routing Traditionally, routing is based on the destination address only and the UAG takes the shortest path to forward a packet. IP Policy Routing (IPPR) provides a mechanism to override the default routing behavior and alter the packet forwarding based on the policy defined by the network administrator. UAG Series User's Guide 203