I need a router to use a primary link and automatically fail over (and later back) to an expensive 3G link.
If I use check-gateway=ping it runs packets periodically over both links witch over time uses the expensive bandwidth I need to minimize aggressively.
What are the tweak-able options on this command to minimize data usage on the 3G link, or are there better alternatives, perhaps building some sort of tunnel and checking if it is up?
The 3G link will not have a static IP but the other link will have one.