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Virtual Private Networking Using IPSec and L2TP Connections
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ProSafe Wireless-N 8-Port Gigabit VPN Firewall FVS318N
4. Modify the settings that you wish to change (see the previous table).
5. Click Apply
to save your changes. The modified IKE policy is displayed in the List of IKE
Policies table.
Manage VPN Policies
You can create two types of VPN policies. When you use the VPN Wizard to create a VPN
policy, only the Auto method is available.
• Man
ual. You manually enter all settings (including the keys) for the VPN tunnel on the
wireless VPN firewall and on the remote VPN endpoint. No third-party server or
organization is involved.
• Auto. Some se
ttings for the VPN tunnel are generated automatically through the use of
the IKE (Internet Key Exchange) Protocol to perform negotiations between the two VPN
endpoints (the local ID endpoint and the remote ID endpoint). You still need to manually
enter all settings on the remote VPN endpoint (unless the remote VPN endpoint also has
a VPN Wizard).
In addition, a certification authority (CA) can also be used to perform authentication (see
Manage Digital Certificates for VPN Connections on p
age 313). For gateways to use a CA to
perform authentication, each VPN gateway needs t
o have a certificate from the CA. For each
certificate, there is both a public key and a private key. The public key is freely distributed,
and is used by any sender to encrypt data intended for the receiver (the key owner). The
receiver then uses its private key to decrypt the data (without the private key, decryption is
impossible). The use of certificates for authentication reduces the amount of data entry that is
required on each VPN endpoint.
VPN Policies Screen
The VPN Policies screen allows you to add additional policies—either Auto or Manual—and
to manage the VPN policies already created. You can edit policies, enable or disable policies,
or delete them entirely. These are the rules for VPN policy use:
• T
raffic covered by a policy is automatically sent through a VPN tunnel.
• When
traffic is covered by two or more policies, the first matching policy is used. (In this
situation, the order of the policies is important. However, if you have only one policy for
each remote VPN endpoint, then the policy order is not important.)
• The VPN tun
nel is created according to the settings in the security association (SA).
• The re
mote VPN endpoint needs to have a matching SA; otherwise, it refuses the
connection.
To access the VPN Policies screen, select VP
N > IPSec VPN > VPN Policies. In the upper
right of the screen, the IPv4 radio button is selected by default. The VPN Policies screen
displays the IPv4 settings. (The following figure shows some examples.) To display the IPv6
settings on the IKE Policies screen, select the IPv6 radio button.