ZyXEL Communications ISG50 User Manual

ISG50 User’s Guide

Use policy routes and static routes to override the ISG50’s default routing behavior in order to send 
packets through the appropriate interface or VPN tunnel. 

For example, the next figure shows a computer (A) connected to the ISG50’s LAN interface. The 
ISG50 routes most traffic from A to the Internet through the ISG50’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.

Example of Policy Routing Topology

Note: You can generally just use policy routes. You only need to use static routes if you 

have a large network with multiple routers where you use RIP or OSPF to propagate 

routing information to other routers. 

• Use  the Policy Route screens (see 

) to list and configure policy routes. 

• Use  the  Static Route screens (see 

) to list and configure static routes.