VPN

L2TP/IPsec

Many operating systems support L2TP/IPsec VPN tunnels, however, Windows XP requires this VPN tunnel protocol. When L2TP/IPsec is enabled, the IOLAN will listen for L2TP/IPsec VPN tunnel requests.

When you enable L2TP/IPsec, you are requiring that all access to the IOLAN go through the L2TP/IPsec tunnel, so you must configure any exceptions first (see Exceptions on page 228 for more information on exceptions) or you will not be able to access the IOLAN through the network unless you are configured to go through the L2TP/IPsec tunnel (you can still access the IOLAN through the Console port).

Field Descriptions

Configure the following parameters:

Allow L2TP/IPsec

When enabled, the IOLAN listens for L2TP/IPsec VPN tunnel connections.

connections

Note: to allow non-VPN tunnel connections to the IOLAN, you must create

 

entries in the VPN Exceptions list.

 

Default: Disabled

Local IP Address

The IPv4 address that the IOLAN will listen on for L2TP/IPsec connections. If

 

the default value (0.0.0.0) is kept, the IOLAN will use the Default Gateway

 

value (if no Default Gateway is specified, L2TP/IPsec VPN connections will

 

not be established).

 

Default: 0.0.0.0

Authentication

Specify the authentication method that will be used between VPN peers to

Method

authenticate the VPN tunnel.

 

Data Options:

 

z Shared Secret—A text-based secret that is used to authenticate the IPsec

 

tunnel (case sensitive).

 

z X.509 Certificate—X.509 certificates are used to authenticate the IPsec

 

tunnel. When using this authentication method, you must include the

 

signing authority’s certificate information in the SSL/TLS CA list and

 

download it to the IOLAN.

 

Default: Shared Secret

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Perle Systems SCS, STS manual Allow L2TP/IPsec