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359
Configuring a Virtual Private Network
Configuring a Virtual Private Network
You can configure the IOLAN to act as a Virtual Private Network (VPN) gateway using the IPsec
protocol. Any of the following scenarios can be configured using one IOLAN and a host/server
running IPsec software or two IOLANs, each acting as the VPN gateway. All the examples have
NAT
Traversal (NAT_T)
enabled, since both VPN gateways are running through routers.
IOLAN-to-Host/Network
The following example shows how to configure an IPsec tunnel between serial devices connected to
the IOLAN and a host/network.
NAT Traversal (NAT_T) is enabled in this example (on both sides)
because the VPN tunnel is going private network to public network to private network. This example
uses an RSA signature for the authentication method, so the steps required to configure the
authentication are in this example.
1. Configure the IPsec tunnel in the IOLAN:
Remote VPN
Gateway
172.16.45.1
Internet
192.168.45.12
192.168.45.87
External IP Address
196.15.23.56
172.16.45.99
192.168.45.99
External IP Address
199.24.23.88
Router
Router
Left
Right
192.168.45.45
IPsec Tunnel--Encrypted Data
Unencrypted
Data
Unencrypted
Data
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