ZyWALL 5/35/70 Series User’s Guide

Figure 158 Telecommuters Sharing One VPN Rule Example

Table 108 Telecommuters Sharing One VPN Rule Example

FIELDS

TELECOMMUTERS

HEADQUARTERS

 

 

 

My ZyWALL:

0.0.0.0 (dynamic IP address

Public static IP address

 

assigned by the ISP)

 

 

Remote Gateway

Public static IP address

0.0.0.0

With this IP address only

Address:

 

the telecommuter can initiate the

 

 

IPSec tunnel.

Local Network - Single

Telecommuter A: 192.168.2.12

192.168.1.10

IP Address:

Telecommuter B: 192.168.3.2

 

 

 

 

 

 

Telecommuter C: 192.168.4.15

 

 

 

 

 

Remote Network -

192.168.1.10

Not Applicable

Single IP Address:

 

 

 

19.18.2 Telecommuters Using Unique VPN Rules Example

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 Section 19.8.1 on page 310), the ZyWALL can use the ID types and contents to distinguish between VPN rules. Telecommuters can each use a separate VPN rule to simultaneously access a ZyWALL at headquarters. They can use different IPSec parameters. The local IP addresses (or ranges of addresses) of the rules configured on the ZyWALL 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 ZyWALL located at headquarters. The ZyWALL 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 ZyWALL at headquarters can also initiate VPN connections to the telecommuters since it can find the telecommuters by resolving their domain names.

Chapter 19 VPN Screens

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