ZyXEL Communications P-662H User Manual

P-662H/HW-D Series User’s Guide

Chapter 16 VPN Screens

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In this example the telecommuters (A, B and C in the figure) use IPSec routers with domain 
names that are mapped to their dynamic WAN IP addresses (use Dynamic DNS to do this).

With aggressive negotiation mode (see 

), the ZyXEL Device can 

use the ID types and contents to distinguish between VPN rules. Telecommuters can each use 
a separate VPN rule to simultaneously access a ZyXEL Device at headquarters. They can use 
different IPSec parameters. The local IP addresses (or ranges of addresses) of the rules 
configured on the ZyXEL Device at headquarters can overlap. The local IP addresses of the 
rules configured on the telecommuters’ IPSec routers should not overlap.

See the following table and figure for an example where three telecommuters each use a 
different VPN rule for a VPN connection with a ZyXEL Device located at headquarters. The 
ZyXEL Device at headquarters (HQ in the figure) identifies each incoming SA by its ID type 
and content and uses the appropriate VPN rule to establish the VPN connection. 

The ZyXEL Device at headquarters can also initiate VPN connections to the telecommuters 
since it can find the telecommuters by resolving their domain names.

Figure 139   Telecommuters Using Unique VPN Rules Example

Table 99   Telecommuters Sharing One VPN Rule Example

My IP Address: 

0.0.0.0 (dynamic IP address assigned 

by the ISP)

Public static IP address 

Secure Gateway IP 

Address:

Public static IP address

0.0.0.0        With this IP address only the 

telecommuter can initiate the IPSec 

tunnel.

Local IP Address: 

Telecommuter A: 192.168.2.12

Telecommuter B: 192.168.3.2

Telecommuter C: 192.168.4.15

192.168.1.10

Remote IP Address: 192.168.1.10

0.0.0.0 (N/A)