ZyXEL Communications Internet Security Gateway ZyWALL 2 Series - Manual (Page 214)

ZyWALL 2 Series User’s Guide
14-8 VPN Screens
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.
14.8 ID Type and Content
With aggressive negotiation mode (see section 14.12.1), the ZyWALL identifies incoming SAs by ID type
and content since this identifying information is not encrypted. This enables the ZyWALL 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 ZyWALL from
IPSec routers with dynamic IP addresses (see section 14.18.2 for a telecommuter configuration example).
Regardless of the ID type and content configuration, the ZyWALL does not allow
you to save multiple active rules with overlapping local and remote IP addresses.
With main mode (see section 14.12.2), the ID type and content are encrypted to provide identity protection.
In this case the ZyWALL can only distinguish between up to 12 different incoming SAs that connect from
remote IPSec routers that have dynamic WAN IP addresses. The ZyWALL 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 section 14.10). 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.
Table 14-3 Local ID Type and Content Fields
LOCAL ID TYPE= CONTENT=
IP Type the IP address of your computer or leave the field blank to have the ZyWALL
automatically use its own IP address.
DNS Type a domain name (up to 31 characters) by which to identify this ZyWALL.
E-mail Type an e-mail address (up to 31 characters) by which to identify this ZyWALL.
The domain name or e-mail address that you use in the Content field is used for identification purposes
only and does not need to be a real domain name or e-mail address.