Meraki MX's allow you to connect 2 WANs, set a default uplink for outbound traffic, and then make more specific rules for certain traffic to choose a certain WAN. E.g. anything to 17.0.0.0/8 goes out WAN1, or anything from 10.0.8.5/32 goes out WAN2. If the uplink specified in one of those rules goes down, traffic will start going out the other interface.
Also, if you have a NAT rule from each uplink to an internal host (e.g. WAN1's 1.1.1.1:80 and WAN2's 2.2.2.2:81 are both NATed to internal host 10.0.8.5:3000), when that internal host responds to an inbound packet, the MX will send the response out the same uplink it came in on. (That might be normal, but I've had trouble configuring that behavior on other platforms.)
I'm moving to 10G uplinks soon (only paying for 2G though) and the smallest MX that supports 10G uplinks is expensive ($10k hardware + $10k 3yr license). I'd like to either 1) buy something cheaper that also has these two functions or 2) build something out of commodity hardware and install software like pfSense or VyOS....or RouterOS?
What do you recommend?
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