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VPN

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 

 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).

Configure the following parameters:

When enabled, the IOLAN listens for L2TP/IPsec VPN tunnel connections. 
Note: to allow non-VPN tunnel connections to the IOLAN, you must create 
entries in the VPN Exceptions list.

Default: Disabled

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 

 

value (if no 

 is specified, L2TP/IPsec VPN connections will 

not be established).

Default: 0.0.0.0

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

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