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Chapter 22 VPN
VMG5313-B10A/-B30A Series User’s Guide
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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.
22.4.7.1 ID Type and Content Examples
Two IPSec routers must have matching ID type and content configuration in order to set up a VPN
tunnel.
The two VMGs in this example can complete negotiation and establish a VPN tunnel.
The two VMGs in this example cannot complete their negotiation because VMG B’s Local ID Type
is IP, but VMG A’s Remote ID Type is set to E-mail. An “ID mismatched” message displays in the
IPSEC LOG.
22.4.8 Pre-Shared Key
A pre-shared key identifies a communicating party during a phase 1 IKE negotiation (see Section
22.4.3 on page 260 for more on IKE phases). It is called “pre-shared” because you have to share it
with another party before you can communicate with them over a secure connection.
22.4.9 Diffie-Hellman (DH) Key Groups
Diffie-Hellman (DH) is a public-key cryptography protocol that allows two parties to establish a
shared secret over an unsecured communications channel. Diffie-Hellman is used within IKE SA
setup to establish session keys. Upon completion of the Diffie-Hellman exchange, the two peers
have a shared secret, but the IKE SA is not authenticated. For authentication, use pre-shared keys.
Table 105 Local ID Type and Content Fields
LOCAL ID TYPE= CONTENT=
IP Type the IP address of your computer.
DNS Type a domain name (up to 31 characters) by which to identify this VMG.
E-mail Type an e-mail address (up to 31 characters) by which to identify this VMG.
The domain name or e-mail address that you use in the Local ID Content field is used
for identification purposes only and does not need to be a real domain name or e-mail
address.
Table 106 Matching ID Type and Content Configuration Example
VMG A VMG B
Local ID type: E-mail Local ID type: IP
Local ID content: tom@yourcompany.com Local ID content: 1.1.1.2
Remote ID type: IP Remote ID type: E-mail
Remote ID content: 1.1.1.2 Remote ID content: tom@yourcompany.com
Table 107 Mismatching ID Type and Content Configuration Example
VMG A VMG B
Local ID type: IP Local ID type: IP
Local ID content: 1.1.1.10 Local ID content: 1.1.1.2
Remote ID type: E-mail Remote ID type: IP
Remote ID content: aa@yahoo.com Remote ID content: 1.1.1.0