Digi TX40 User Manual page 617

Virtual Private Networks (VPN)
(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 TX40 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.
9. Set the Security Parameter Index (SPI) value, which is used in the authentication extension
when registering. This should be normally left at the default setting of 256 unless your service
provider indicates a different value.
(config vpn nemo nemo_example)> spi integer
(config vpn nemo nemo_example)>
Allowed values are any integer between 256 and 4294967295.
10. Set the firewall zone for the NEMO tunnel to internal:
(config vpn nemo nemo_example)> zone internal
(config vpn nemo nemo_example)>
The Internal firewall zone configures the TX40 device to trust traffic going to the tunnel and
allows it through the network.
11. Configure the Care-of-Address, the local WAN interface of the internet facing network.
a. Set the method to determine the Care-of-Address:
(config vpn nemo nemo_example)> coaddress type value
(config vpn nemo nemo_example)>
where value is one of:
n
n
n
TX40 User Guide
defaultroute: Uses the same network interface as the default route.
interface
If interface is used, set the interface:
i. Use the ? to determine available interfaces:
ii. Set the interface. For example:
(config vpn nemo nemo_example)> coaddress interface wan1
(config vpn nemo nemo_example)>
ip
If ip is used, set the IP address:
NEMO
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