ZyXEL Communications 200 Series - Manual (Page 376)

Chapter 20 IPSec VPN
ZyWALL USG 100/200 Series User’s Guide
376
Router identity consists of ID type and content. The ID type can be domain name, IP address,
or e-mail address, and the content is a (properly-formatted) domain name, IP address, or e-
mail address. The content is only used for identification. Any domain name or e-mail address
that you enter does not have to actually exist. Similarly, any domain name or IP address that
you enter does not have to correspond to the ZyWALL’s or remote IPSec router’s properties.
The ZyWALL and the remote IPSec router have their own identities, so both of them must
store two sets of information, one for themselves and one for the other router. Local ID type
and content refers to the ID type and content that applies to the router itself, and peer ID type
and content refers to the ID type and content that applies to the other router.
"
The ZyWALL’s local and peer ID type and content must match the remote
IPSec router’s peer and local ID type and content, respectively.
For example, in Table 123 on page 376 , the ZyWALL and the remote IPSec router
authenticate each other successfully. In contrast, in Table 124 on page 376 , the ZyWALL and
the remote IPSec router cannot authenticate each other and, therefore, 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 less secure, so you should only
use this if your ZyWALL provides another way to check the identity of the remote IPSec
router (for example, extended authentication) or if you are troubleshooting a VPN tunnel.
Additional Topics for IKE SA
This section provides more information about IKE SA.
Negotiation Mode
There are two negotiation modes--main mode and aggressive mode. Main mode provides
better security, while aggressive mode is faster.
Table 123 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 124 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: 1.1.1.20 Peer ID content: [email protected]