ZyXEL nbg-5715 Guia Do Utilizador

Chapter 18 IPSec VPN

NBG5715 User’s Guide

You can usually provide a static IP address or a domain name for the remote IPSec router as well. 
Sometimes, you might not know the IP address of the remote IPSec router (for example, 
telecommuters). In this case, you can still set up the IKE SA, but only the remote IPSec router can 
initiate an IKE SA.

Once the NBG5715 and remote IPSec router have established the IKE SA, they can securely 
negotiate an IPSec SA through which to send data between computers on the networks.

Note: The IPSec SA stays connected even if the underlying IKE SA is not available 

anymore.

In an IPSec SA, the local network consists of devices connected to the NBG5715 and may be called 
the local policy. Similarly, the remote network consists of the devices connected to the remote 
IPSec router and may be called the remote policy.

Note: It is not recommended to set a VPN rule’s local and remote network settings both 

to 0.0.0.0 (any). This causes the NBG5715 to try to forward all access attempts (to 

the local network, the Internet or even the NBG5715) to the remote IPSec router. 

In this case, you can no longer manage the NBG5715.

The following figure helps explain the main fields in the web configurator.

IPSec Fields Summary  

Local and remote IP addresses must be static.

Local IP Address

Remote IP Address

Remote 
IPSec Router