ZyXEL Communications ZyWALL 2 Plus - Manual (Page 259)

Chapter 14 IPSec VPN
ZyWALL 2 Plus User’s Guide
259
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The ZyWALL and the remote IPSec router must use the same pre-shared key.
Router identity consists of ID type and ID content. The ID type can be IP address, domain
name, or e-mail address, and the ID content is a specific IP address, domain name, or e-mail
address. The ID content is only used for identification; the IP address, domain name, or e-mail
address that you enter does not have to actually exist.
The ZyWALL and the remote IPSec router each has its own identity, so each one must store
two sets of information, one for itself and one for the other router. Local ID type and ID
content refers to the ID type and ID content that applies to the router itself, and peer ID type
and ID content refers to the ID type and ID content that applies to the other router in the IKE
SA.
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The ZyWALL’s local and peer ID type and ID content must match the remote
IPSec router’s peer and local ID type and ID content, respectively.
In the following example, the ID type and content match so the ZyWALL and the remote
IPSec router authenticate each other successfully.
In the following example, the ID type and content do not match so the authentication fails and
the ZyWALL and the remote IPSec router cannot establish an IKE SA.
It is also possible to configure the ZyWALL to ignore the identity of the remote IPSec router.
In this case, you usually set the peer ID type to Any. This is not as secure as other peer ID
types, however.
14.3.1.2.1 Certificates
It is also possible for the ZyWALL and remote IPSec router to authenticate each other with
certificates. In this case, the authentication process is different.
Table 65 VPN Example: Matching ID Type and Content
ZYWALL REMOTE IPSEC ROUTER
Local ID type: E-mail Local ID type: IP
Local ID content: [email protected] Local ID content: 1.1.1.2
Peer ID type: IP Peer ID type: E-mail
Peer ID content: 1.1.1.2 Peer ID content: [email protected]
Table 66 VPN Example: Mismatching ID Type and Content
ZYWALL REMOTE IPSEC ROUTER
Local ID type: E-mail Local ID type: IP
Local ID content: [email protected] Local ID content: 1.1.1.2
Peer ID type: IP Peer ID type: E-mail
Peer ID content: 1.1.1.15 Peer ID content: [email protected]