Policy And Static Routes; Overview; What You Can Do In This Chapter; What You Need To Know - ZyXEL Communications NXC2500 User Manual

9.1 Overview

Use policy routes and static routes to override the NXC's default routing behavior in order to send
packets through the appropriate interface.

9.1.1 What You Can Do in this Chapter

• The Policy Route screens
• The Static Route screens

9.1.2 What You Need to Know

The following terms and concepts may help as you read this chapter.
Policy Routing
Traditionally, routing is based on the destination address only and the NXC 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.
Policy-based routing is applied to incoming packets on a per interface basis, prior to the normal
routing.
How You Can Use Policy Routing
• Source-Based Routing – Network administrators can use policy-based routing to direct traffic
from different users through different connections.
• Cost Savings – IPPR allows organizations to distribute interactive traffic on high-bandwidth, high-
cost paths while using low-cost paths for batch traffic.
• Load Sharing – Network administrators can use IPPR to distribute traffic among multiple paths.
Static Routes
The NXC usually uses the default gateway to route outbound traffic from computers on the LAN to
the Internet. To have the NXC send data to devices not reachable through the default gateway, use
static routes.
Policy Routes Versus Static Routes
• Policy routes are more flexible than static routes. You can select more criteria for the traffic to
match and can also use schedules and NAT.
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H A PT ER

Policy and Static Routes

(Section 9.2 on page 139) list and configure policy routes.
(Section 9.3 on page 144) list and configure static routes.
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