ZyXEL Communications P-660HN-F1 User Manual
Chapter 9 Firewalls
P-660HN-F1 User’s Guide
170
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.
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.
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
1
2
3
LAN
A
ISP 1
ISP 2
4
WAN
Subnet 1
Subnet 2