So, we have a 4G SimpliFi system hooked up as a Backup WAN Link. We've tested this, works GREAT! However, we've identified that in the event of a WAN failover to our backup link, we want to only deliver Internet access to those services we've deemed critical. So I know how to build firewall rules around the services we want to allow. But how do I create them so that our other rules do not take over and allow all traffic. We really only need like 5 Internet destinations to run our business when our main Internet fails. We want to prevent the rest so we don't get high data charges for things like automatic Microsoft Updates, streaming video/music, etc. How would you go about it?
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