The Meraki MX works differently than you expect. Both devices need a constant connection to the dashboard. With the /30, you are pretty limited here. What can you do: Get/29 subnets from your ISP. This is the best option. Connect the first ISP to MX1 and the second ISP to MX2. In this setup, the active firewall will always use only one ISP: ISP1 while MX1 is active and ISP2 while MX2 is active. Place a NAT router in front of the MXes. With a private subnet between the router and the MXes, both can communicate to the dashboard at the same time. EDIT: I didn't see that you have /29s on the LAN side. If option 1 with a /29 transfer is not possible, then option 2 is even easier. Instead of a NAT router you can take two small L3 switches and work without NAT. On this L3-Switch, the /30 goes to the ISP, the /29 goes to the MXes. Some more information on the different options: https://cyber-fi.net/index.php/2024/02/19/connecting-your-meraki-mx-to-the-internet/
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