ZyXEL Communications ZyWALL USG FLEX 100 - Page 3

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What Could Go Wrong? ...................................................................... 85
How to Configure IPSec Site to Site VPN while one Site is behind a NAT
router ........................................................................................................... 87
Set Up the ZyWALL/USG IPSec VPN Tunnel of Corporate Network
(HQ) ........................................................................................................ 87
Set Up the ZyWALL/USG IPSec VPN Tunnel of Corporate Network
(Branch) .................................................................................................. 91
Set Up the NAT Router (Using ZyWALL USG device in this example) 95
Test the IPSec VPN Tunnel ..................................................................... 97
What Could Go Wrong? ....................................................................... 98
How to Configure Hub-and-Spoke IPSec VPN ........................................ 99
Set Up the IPSec VPN Tunnel on the ZyWALL/USG by Using VPN
Concentrator Hub_HQ-to-Branch_A ................................................ 100
Hub_HQ-to-Branch_B .......................................................................... 104
Hub_HQ Concentrator ....................................................................... 108
Spoke_Branch_A ................................................................................. 109
Spoke_Branch_B .................................................................................. 114
Test the IPSec VPN Tunnel ................................................................... 119
What Could Go Wrong? .................................................................... 123
Set Up the IPSec VPN Tunnel of ZyWALL/USG without Using VPN
Concentrator Hub_HQ-to-Branch_A ................................................ 125
Hub_HQ-to-Branch_B .......................................................................... 128
Spoke_Branch_A ................................................................................. 131
Spoke_Branch_B .................................................................................. 134
Test the IPSec VPN Tunnel ................................................................... 137
What Could Go Wrong? .................................................................... 140
How to Use Dual-WAN to Perform Fail-Over on VPN Using the VPN
Concentrator ............................................................................................ 142
Set Up the IPSec VPN Tunnel on the ZyWALL/USG Hub_HQ-to-
Branch_A .............................................................................................. 143
Hub_HQ-to-Branch_B .......................................................................... 146
Hub_HQ Concentrator ....................................................................... 149
Spoke_Branch_A ................................................................................. 150
Spoke_Branch_B .................................................................................. 153