ZyXEL Communications P-660 series Guia do Utilizador descarregar pdf (Página 102)

Chapter 7 Firewalls

P-660R-F1 Series User’s Guide

102

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

Figure 62 “Triangle Route” Problem

7.5.4.2 Solving the “Triangle Route” Problem

If you have the ZyXEL Device allow triangle route sessions, traffic from the WAN can go directly to

a LAN computer without passing through the ZyXEL Device and its firewall protection.

Another solution 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.

It’s like having multiple LAN networks that actually use the same physical cables and ports. 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.

WAN

LAN

ISP 1

ISP 2

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ZyXEL Communications P-660 series Guia do Utilizador Página 102