Policy Routing Technical Reference - ZyXEL Communications ZyWALL USG 1000 User Manual

Unified security gateway

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Table of Contents

Table 84 Configuration > Network > Routing > Static Route > Add (continued)

15.4 Policy Routing Technical Reference

Here is more detailed information about some of the features you can configure in

policy routing.

NAT and SNAT

NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP

address in a packet in one network to a different IP address in another network.

Use SNAT (Source NAT) to change the source IP address in one network to a

different IP address in another network.

Assured Forwarding (AF) PHB for DiffServ

Assured Forwarding (AF) behavior is defined in RFC 2597. The AF behavior group

defines four AF classes. Inside each class, packets are given a high, medium or

low drop precedence. The drop precedence determines the probability that routers

in the network will drop packets when congestion occurs. If congestion occurs

between classes, the traffic in the higher class (smaller numbered class) is

generally given priority. Combining the classes and drop precedence produces the

ZyWALL USG 1000 User's Guide

Select the radio button and enter the IP address of the next-hop

gateway. The gateway is a router or switch on the same segment as your

ZyWALL's interface(s). The gateway helps forward packets to their

destinations.

Select the radio button and a predefined interface through which the

traffic is sent.

Metric represents the "cost" of transmission for routing purposes. IP

routing uses hop count as the measurement of cost, with a minimum of 1

for directly connected networks. Enter a number that approximates the

cost for this link. The number need not be precise, but it must be 0~127.

In practice, 2 or 3 is usually a good number.

Click OK to save your changes back to the ZyWALL.

Click Cancel to exit this screen without saving.

Chapter 15 Policy and Static Routes