ZyXEL Communications P-324 User Manual page 345

Prestige 324 User's Guide
The "Triangle Route" Solutions
This section presents you two solutions to the "triangle route" problem.
IP Aliasing
IP alias allows you to partition your network into logical sections over the same Ethernet interface. Your
Prestige supports up to three logical LAN interfaces with the Prestige being the gateway for each logical
network. By putting your LAN and Gateway B in different subnets, all returning network traffic must pass
through the Prestige to your LAN. The following steps describe such a scenario.
Step 1.
A computer on the LAN initiates a connection by sending a SYN packet to a receiving server on
the WAN.
Step 2.
The Prestige reroutes the packet to Gateway B which is in Subnet 2.
Step 3. The reply from WAN goes through the Prestige to the computer on the LAN in Subnet 1.
G-2
Diagram G-2 "Triangle Route" Problem
Triangle Route