Figure 94 Ip Alias - ZyXEL Communications P-660HN User Manual

Chapter 9 Firewalls
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.
4 The ZyXEL Device then sends it to the computer on the LAN in Subnet 1.

Figure 94 IP Alias

170
LAN
Subnet 1
1
4
2
Subnet 2
WAN
ISP 1
ISP 2
3
A
P-660HN-Fx User's Guide