ZyXEL Communications ZyXEL Vantage VSG-1000 - Manual (Page 39)

VSG-1000 Vantage Service Gateway
System Configuration 4-5
Table 4-4 NAT Example: Many-to-One
SUBSCRIBER ORIGINAL SOURCE IP TRANSLATED SOURCE IP
S1 10.59.1.2 211.21.21.2
S2 10.59.1.3 221.21.21.2
Example 3: One-to-One and Many-to-One
The figure below shows an example where subscriber S1 tires to connect to VPN server V1 while subscriber S2 and
S3 try to connect to the same VPN server V2 at the same time. In this case, subscribers S1 and S2 map to the same
WAN IP address since the destination is different while subscriber S3 maps to a different WAN IP address.
Figure 4-3 NAT Example: One-to-One and Many-to-One
The following table shows the address mapping.
Table 4-5 NAT Example: One-to-One and Many-to-One
SUBSCRIBER ORIGINAL SOURCE IP TRANSLATED SOURCE IP
S1 10.59.1.2 211.21.21.2
S2 10.59.1.3 221.21.21.2
S3 10.59.1.4 221.21.21.3
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).
4.8 The System Configuration Screen
From the Main Menu screen, click Configuration and System to display the screen as shown.