Digi TX54 User Manual page 537

Virtual Private Networks (VPN)
1. Log into the TX54 command line as a user with full Admin access rights.
Depending on your device configuration, you may be presented with an Access selection
menu. Type admin to access the Admin CLI.
2. At the command line, type config to enter configuration mode:
> config
(config)>
3. Add a NEMO tunnel. For example, to add a NEMO tunnel named nemo_example:
(config)> add vpn nemo nemo_example
(config vpn nemo nemo_example)>
The NEMO tunnel is enabled by default. To disable:
(config vpn nemo nemo_example)> enable false
(config vpn nemo nemo_example)>
4. Set the IPv4 address of the NEMO virtual network interface:
(config vpn nemo nemo_example)> home_address IPv4_address
(config vpn nemo nemo_example)>
5. Set the IPv4 address of the NEMO home agent. This is provided by your cellular carrier.
(config vpn nemo nemo_example)> home_agent IPv4_address
(config vpn nemo nemo_example)>
6. Set the key used to authenticate to the home agent. This is provided by your cellular carrier.
(config vpn nemo nemo_example)> key value
(config vpn nemo nemo_example)>
7. Set the the number of seconds number of seconds until the authorization key expires. This is
provided by your cellular carrier.
(config vpn nemo nemo_example)> lifetime integer
(config vpn nemo nemo_example)>
Allowed values are any integer between 1 and 65535.
8. MTU discovery is enabled by default, which allows the device to determine the maximum
transmission unit (MTU) size. To disable:
(config vpn nemo nemo_example)> mtu_discovery false
(config vpn nemo nemo_example)>
If disabled, set the MTU size. The default MTU size for LANs on the TX54 device is 1500. The
MTU size of the NEMO tunnel will be smaller, to take into account the required headers.
(config vpn nemo nemo_example)> mtu integer
(config vpn nemo nemo_example)>
Allowed values are any integer between 68 and 1476.
TX54 User Guide
NEMO
537