ZyXEL Communications ADSL VoIP IAD with 802.11g Wireless 2602HW Series Guide de l'utilisateur télécharger pdf (Page 459)

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Prestige 2602HW Series User’s Guide

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APPENDIX H

Triangle Route

The Ideal Setup

When the firewall is on, your Prestige acts as a secure gateway between your LAN and the

Internet. In an ideal network topology, all incoming and outgoing network traffic passes

through the Prestige to protect your LAN against attacks.

Figure 284 Ideal Setup

The “Triangle Route” Problem

A traffic route is a path for sending or receiving data packets between two Ethernet devices.

Some companies have more than one alternate route to one or more ISPs. If the LAN and

ISP(s) are in the same subnet, the “triangle route” problem may occur. The steps below

describe the “triangle route” problem.

1 A computer on the LAN initiates a connection by sending out a SYN packet to a

receiving server on the WAN.

2 The Prestige reroutes the SYN packet through Gateway B on the LAN to the WAN.

3 The reply from the WAN goes directly to the computer on the LAN without going

through the Prestige.

As a result, the Prestige resets the connection, as the connection has not been acknowledged.

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