This information is not that unimportant ... There is also only one ISP on the firewall? On the MX, you could use the same IP on both WANs, but it doesn't help as the firewall needs to differentiate both WAN ports. If you set them to different IPs, I would assume that it would work if the ISP firewall doesn't mess up the NAT. But that could be solved with two dedicated 1:1 translations on the firewall. Still, if a customer approached me with this design, I would think they wanted to kid me.
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