Because the IKE and IPSec connections are separate, they have different SAs (secu- rity associations).
Policies
VPN configuration settings are stored in Policies.
Note that different vendors use different terms. Generally, the terms "VPN Policy", "IPSec Policy", and "IPSec Proposal" have the same meaning. However, some vendors separate IKE Policies (Phase 1 parameters) from IPSec Policies (Phase 2 parameters).
For the
•The address of the remote VPN endpoint
•The traffic which is allowed to use the VPN connection.
•The parameters (settings) for the IPSec SA (Security Association)
•If IKE is used, the parameters (settings) for the IKE SA (Security Association)
Generally, you will need at least one (1) VPN Policy for each remote site for which you wish to establish VPN connections.
It is possible, and sometimes necessary, to have multiple Policies for the same remote site. However, you should only Enable one (1) policy at a time.
VPN Configuration
The general rule is that each endpoint must have matching Policies, as follows:
VPN Endpoint | Each VPN endpoint must be configured to initiate or accept |
address | connections to the remote VPN client or Gateway. |
| Usually, this requires having a fixed Internet IP address. How- |
| ever, it is possible for a VPN Gateway to accept incoming |
| connections from a remote client where the client's IP address |
| is not known in advance. |
Local & Remote | This determines which outgoing traffic will cause a VPN connec- |
LAN definition | tion to be established, and which incoming traffic will be |
| accepted. Each endpoint must be configured to pass and ac- |
| cept the desired traffic from the remote endpoint. |
If connecting 2 LANs, this requires that:
•Each endpoint must be aware of the IP addresses used on the other endpoint.
•The 2 LANs MUST use different IP address ranges.
IKE parameters If using IKE (recommended), the IKE parameters must match (except for the SA lifetime, which can be different).
IPSec parame- The IPSec parameters at each endpoint must match. ters
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