ZyXEL Communications Vantage Service Gateway VSG-1200 V2 User Manual

VSG-1200 V2 User’s Guide

Chapter 8 NAT Pool

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Note: You only need to set the NAT address pool if the remote VPN server(s) allows 

only one connection per source IP address.      

You need to acquire additional public IP address(es) from your ISP to create 
NAT pool(s). 

To set the NAT address pool, click System Settings and NAT Pool in the navigation panel. A 
screen displays as shown next. 

Figure 29   System Settings: NAT Pool  

The following table describes the labels in this screen. 

Table 15   NAT Example: One-to-One and Many-to-One

S1

10.59.1.2

211.21.21.2

S2

10.59.1.3

211.21.21.2

S3

10.59.1.4

211.21.21.3

Table 16   System Settings: NAT Pool 

Disable

Select this option to deactivate this feature. Subscribers are not be able to establish 

multiple connections simultaneously to the same VPN server (that has the single-

connection-per-source limitation). 

Enable 

Select this option to perform address translation on the WAN to allow subscribers to 

establish simultaneous connections to the same VPN server (that has the single-

connection-per-source limitation). 
You must then configure the address pool for VPN connections.