Chapter 15 Firewall
AMG1302-T11C User’s Guide
180
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 AMG1302-T11C 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 AMG1302-T11C reroutes the packet to Gateway A, which is in Subnet 2.
3 The reply from the WAN goes to the AMG1302-T11C.
4 The AMG1302-T11C then sends it to the computer on the LAN in Subnet 1.
Figure 93 IP Alias
1
2
3
LAN
A
ISP 1
ISP 2
4
WAN
Subnet 1
Subnet 2
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