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Chapter 16 VPN
ADSL Series User’s Guide
218
16.6.8 ID Type and Content
With aggressive negotiation mode (seeSection 16.6.6 on page 217), 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
(seeSection 16.6.11 on page 219 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 (seeSection 16.6.6 on page 217), 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 (seeSection 16.4 on
page 210). 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 68 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.
E-mail Type an e-mail address (up to 31 characters) by which to identify this ZyXEL
Device.
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.
Table 69 Peer ID Type and Content Fields
PEER ID TYPE= CONTENT=
IP Type the IP address of the computer with which you will make the VPN connection
or leave the field blank to have the ZyXEL Device automatically use the address in
the Secure Gateway Address field.
DNS Type a domain name (up to 31 characters) by which to identify the remote IPSec
router.
E-mail Type an e-mail address (up to 31 characters) by which to identify the remote
IPSec router.
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. The domain name also does not have to match the remote router’s
IP address or what you configure in the Secure Gateway Address field below.