ZyXEL P-662H-D3 User Guide - Page 227
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Figure 131 VPN Host using Intranet DNS Server Example Chapter 16 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. 16.9 ID Type and Content With aggressive negotiation mode (see Section 16.12.1 on page 234), the ZyXEL Device identifies incoming SAs by ID type and content since this identifying information is not encrypted. This enables the ZyXEL Device 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 ZyXEL Device from IPSec routers with dynamic IP addresses (see Section 16.18 on page 243 for a telecommuter configuration example). Regardless of the ID type and content configuration, the ZyXEL Device does not allow you to save multiple active rules with overlapping local and remote IP addresses. With main mode (see Section 16.12.1 on page 234), the ID type and content are encrypted to provide identity protection. In this case the ZyXEL Device can only distinguish between up to 12 different incoming SAs that connect from remote IPSec routers that have dynamic WAN IP addresses. The ZyXEL Device 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 16.13 on page 235). 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 89 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 ZyXEL Device automatically use its own IP address. DNS Type a domain name (up to 31 characters) by which to identify this ZyXEL Device. P-662H/HW-D Series User's Guide 227