PLANET CS-2001 - Manual (Page 357)

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11.1.5 Establishing an IPSec VPN Connection by Three
CS-2001 Devices
Prerequisite Setup (Note: IP addresses used as examples only)
A Company: Configure Port1 as LAN1(192.168.10.1). IP range: 192.168.10.x/24.
Configure Port2 as WAN1(61.11.11.11) and connect it to the ADSL
Termination Unit Remote (ATUR) to access the Internet.
B Company: Configure Port1 as LAN1(192.168.20.1). IP range: 192.168.20.x/24.
Configure Port2 as WAN1(211.22.22.22) and connect it to the ADSL
Termination Unit Remote (ATUR) to access the Internet.
C Company: Configure Port1 as LAN1(192.168.30.1). IP range:192.168.30.x/24.
Configure Port2 as WAN1(121.33.33.33) and connect it to the ADSL
Termination Unit Remote to access the Internet.
This example is to use three CS-2001 devices to establish VPN connection among A
Company, B Company and C Company.