Solution:
Login into the IOLAN, admin user level,
Login: admin
Password:xxxxxxxxx
at the # type the following, for this example the default gateway is a router, you can choose any name.
This document assumes the IOLAN's IP address and Subnet mask has already been set.
SDS1# add host router 10.10.100.10
SDS1# add gateway router default
Save the entry
SDS1# save
Save config to flash ROM y/n y
Saving to flash ROM. This may take several seconds. Please wait...
Show the gateway entry
SDS1# show gateway
Gateway Service Internet Address?Gateway Type
router ?Default Host
SDS1#
reboot the IOLAN for the route to take effect.