ISP redundancy

Hi all,

I got a two machines, gate1 and gate2. Schema:


This is a work network, but I want to make the ISP redundant on gate1, look at the example:

I supposed failover, but I read this, Example 32-2, but this is a local network.

What do you propose to use? I have a little experience with freebsd FreeBSD, can you explain for dummies, please?
 
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