ZyXEL Communications P-660H Series - Figure 200 Triangle Route Problem; Figure 201 IP Alias; IP Aliasing

P-660H/HW-D Series User’s Guide
351 Appendix N Triangle Route
Figure 200 “Triangle Route” Problem
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.
1 A computer on the LAN initiates a connection by sending a SYN packet to a receiving
server on the WAN.
2 The Prestige reroutes the packet to Gateway A, which is in Subnet 2.
3 The reply from WAN goes through the Prestige to the computer on the LAN in Subnet 1.
Figure 201 IP Alias