ZyXEL p-662h-61 Guia Do Utilizador

Prestige 662HW Series User’s Guide

Chapter 19 VPN Screens

222

When you initiate an IPSec tunnel with keep alive enabled, the Prestige automatically 
renegotiates the tunnel when the IPSec SA lifetime period expires (see

for more on the IPSec SA lifetime). In effect, the IPSec tunnel becomes an “always on” 
connection after you initiate it. Both IPSec routers must have a Prestige-compatible keep alive 
feature enabled in order for this feature to work.

If the Prestige has its maximum number of simultaneous IPSec tunnels connected to it and 
they all have keep alive enabled, then no other tunnels can take a turn connecting to the 
Prestige because the Prestige never drops the tunnels that are already connected. Refer to

to see how many simultaneous IPSec SAs your Prestige model 

can support.

When there is outbound traffic with no inbound traffic, the Prestige automatically drops the 
tunnel after two minutes.

NAT traversal allows you to set up a VPN connection when there are NAT routers between the 
two IPSec routers.

Remote 
Address

This is the IP address(es) of computer(s) on the remote network behind the remote 
IPSec router.

This field displays N/A when the Secure Gateway Address field displays 0.0.0.0. In 
this case only the remote IPSec router can initiate the VPN.

The same (static) IP address is displayed twice when the Remote Address Type 
field in the VPN-IKE (or VPN-Manual Key) screen is configured to Single. 

The beginning and ending (static) IP addresses, in a range of computers are 
displayed when the Remote Address Type field in the VPN-IKE (or VPN-Manual 
Key) screen is configured to Range.

A (static) IP address and a subnet mask are displayed when the Remote Address 
Type field in the VPN-IKE (or VPN-Manual Key) screen is configured to Subnet.

Encap.

This field displays Tunnel or Transport mode (Tunnel is the default selection).

IPSec Algorithm This field displays the security protocols used for an SA. 

Both AH and ESP increase Prestige processing requirements and communications 
latency (delay). 

Secure Gateway 
IP

This is the static WAN IP address or URL of the remote IPSec router. This field 
displays 0.0.0.0 when you configure the Secure Gateway Address field in the VPN-
IKE screen to 0.0.0.0.

Back

Click Back to return to the previous screen.

Table 67   VPN Summary (continued)