ZyXEL ADSL Prestige 662HW-61 130122.0662HW61 Manual Do Utilizador

Prestige 662H/HW Series User’s Guide

Chapter 19 VPN Screens

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Figure 96   VPN Host using Intranet DNS Server Example

If you do not specify an Intranet DNS server on the remote network, then the VPN host must 
use IP addresses to access the computers on the remote network.

With aggressive negotiation mode (see

), the Prestige identifies 

incoming SAs by ID type and content since this identifying information is not encrypted. This 
enables the Prestige to distinguish between multiple rules for SAs that connect from remote 
IPSec routers that have dynamic WAN IP addresses. Telecommuters can use separate 
passwords to simultaneously connect to the Prestige from IPSec routers with dynamic IP 
addresses (see

configuration example).

Regardless of the ID type and content configuration, the Prestige does not allow you to save 
multiple active rules with overlapping local and remote IP addresses.

With main mode (see

), the ID type and content are encrypted to 

provide identity protection. In this case the Prestige can only distinguish between up to 12 
different incoming SAs that connect from remote IPSec routers that have dynamic WAN IP 
addresses. The Prestige can distinguish up to 12 incoming SAs because you can select between 
three encryption algorithms (DES, 3DES and AES), two authentication algorithms (MD5 and 
SHA1) and two key groups (DH1 and DH2) when you configure a VPN rule (see

). The ID type and content act as an extra level of 

identification for incoming SAs.

The type of ID can be a domain name, an IP address or an e-mail address. The content is the IP 
address, domain name, or e-mail address.