P-662H/HW-D Series User’s Guide

Table 28 WAN Backup Advanced Setup

LABEL

DESCRIPTION

 

 

Advanced

Click the Edit button to display the Advanced Modem Setup screen and edit the

Modem Setup

details of your dial backup setup.

TCP/IP Options

 

 

 

Metric

This field sets this route's priority among the three routes the ZyXEL Device uses

 

(normal, traffic redirect and dial backup). Type a number (1 to 15) to set the priority

 

of the dial backup route for data transmission. The smaller the number, the higher

 

the priority.

 

If the three routes have the same metrics, the priority of the routes is as follows:

 

WAN, Traffic Redirect, Dial Backup.

Enable SUA

Network Address Translation (NAT) allows the translation of an Internet protocol

 

address used within one network to a different IP address known within another

 

network.

 

SUA (Single User Account) is a subset of NAT that supports two types of mapping:

 

Many-to-One and Server.

Enable RIP

Select this check box to turn on RIP (Routing Information Protocol), which allows a

 

router to exchange routing information with other routers.

RIP Version

The RIP Version field controls the format and the broadcasting method of the RIP

 

packets that the ZyXEL Device sends (it recognizes both formats when receiving).

 

Choose RIP-1,RIP-2B or RIP-2M.

 

RIP-1 is universally supported; but RIP-2 carries more information. RIP-1 is

 

probably adequate for most networks, unless you have an unusual network

 

topology. Both RIP-2B and RIP-2M sends the routing data in RIP-2 format; the

 

difference being that RIP-2B uses subnet broadcasting while RIP-2M uses

 

multicasting. Multicasting can reduce the load on non-router machines since they

 

generally do not listen to the RIP multicast address and so will not receive the RIP

 

packets. However, if one router uses multicasting, then all routers on your network

 

must use multicasting, also.

RIP Direction

RIP (Routing Information Protocol) allows a router to exchange routing information

 

with other routers. The RIP Direction field controls the sending and receiving of RIP

 

packets.

 

Choose Both, In Only or Out Only.

 

When set to Both or Out Only, the ZyXEL Device will broadcast its routing table

 

periodically.

 

When set to Both or In Only, the ZyXEL Device will incorporate RIP information

 

that it receives.

Enable Multicast

Select this check box to turn on IGMP (Internet Group Multicast Protocol). IGMP is

 

a network-layer protocol used to establish membership in a Multicast group - it is

 

not used to carry user data.

Multicast

Select IGMP-v1or IGMP-v2. IGMP version 2 (RFC 2236) is an improvement over

 

version 1 (RFC 1112) but IGMP version 1 is still in wide use. If you would like to

 

read more detailed information about interoperability between IGMP version 2 and

 

version 1, please see sections 4 and 5 of RFC 2236.

PPP Options

 

 

 

Encapsulation

Select CISCO PPP from the drop-down list box if your backup WAN device uses

 

Cisco PPP encapsulation; otherwise select Standard PPP.

Compression

Select this check box to enable stac compression.

 

 

Connection

 

 

 

Nailed-Up

Select Nailed-Up Connection when you want your connection up all the time. The

Connection

ZyXEL Device will try to bring up the connection automatically if it is disconnected.

104

Chapter 5 WAN Setup