ZyXEL Communications 662HW Series - Manual (Page 224)

Prestige 662H/HW Series User’s Guide
Chapter 19 VPN Screens 224
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.
19.8 ID Type and Content
With aggressive negotiation mode (see the Negotiation Mode section ), 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
the Telecommuter VPN/IPSec Examples section for a telecommuter
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 Negotiation Mode section ), 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
Configuring Advanced IKE Settings section ). 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.