ZyXEL P-661H Series Bedienungsanleitung PDF herunterladen (Seite 153)

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Chapter 9 Firewall Configuration

P-661H/HW Series User’s Guide

153

Figure 84 “Triangle Route” Problem

9.5.2 Solving the “Triangle Route” Problem

You can have the ZyXEL Device allow triangle route sessions. However this can allow traffic

from the WAN to go directly to a LAN computer without passing through the ZyXEL Device

and its firewall protection.

Another way to solve the triangle route problem is to use IP alias. IP alias allows you to

partition your network into logical sections over the same Ethernet interface. Your ZyXEL

Device supports up to three logical LAN interfaces with the ZyXEL Device being the gateway

for each logical network. By putting your LAN and Gateway A in different subnets, all

returning network traffic must pass through the ZyXEL Device to your LAN. The following

steps describe such a scenario.

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

server on the WAN.

2 The ZyXEL Device reroutes the packet to Gateway A, which is in Subnet 2.

3 The reply from the WAN goes to the ZyXEL Device.

4 The ZyXEL Device then sends it to the computer on the LAN in Subnet 1.

Figure 85 IP Alias

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