ZyXEL Communications MAX-306, User Manual, Page: 210 / 405

Chapter 16 The Firewall Screens
User’s Guide
210
As a result, the WiMAX Device resets the connection, as the connection has not
been acknowledged.
Figure 96 “Triangle Route” Problem
16.4.3.1 Solving the “Triangle Route” Problem
If you have the WiMAX Device allow triangle route sessions, traffic from the WAN
can go directly to a LAN computer without passing through the WiMAX 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 WiMAX Device
supports up to three logical LAN interfaces with the WiMAX 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 WiMAX 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 WiMAX Device reroutes the packet to Gateway A, which is in Subnet 2.
3
The reply from the WAN goes to the WiMAX Device.