Zyxel ZyWALL USG 20W — ensure reliable intranet server access with NAT failover [41/185]

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ZyWALL USG Support Notes

Traffic can go through this tunnel.

1.10. One to One NAT Link Fail Over

1.10.1. Network Scenario

In some cases, network administrator may want to make sure his/her intranet server

always available from outside.

In the scenario below, WAN1 is connected to ISP1, and WAN2 is connected to ISP2.

WAN1: 200.0.0.1. Non-interface IP: 200.0.0.4

WAN2: 200.0.1.1. Non-interface IP: 200.0.1.4

Requirements:

 Outside clients can access the intranet server 192.168.1.33 via both WAN1 and

WAN2 from the non-interface IP, performing load balance for the server access

traffic between WAN1 and WAN2.

 In case WAN1 fails, the intranet server still can be accessed via WAN2.

 The source address of the outgoing traffic initiated from the server will be

mapped to the non-interface IP.