I would have thought so too but it couldn't find the Internet or Meraki Portal. Thinking maybe the fiber handoff was bad, I tried hooking a laptop to it. Windows definitely doesn't like a /31 and threw an error saving the IP information. Researching that, found others just entered a /24 instead. Laptop connected fine with supplied IP, Gateway, and 255.255.255.0.   After that, why not try the same on the MX. It connected no problem. Responded to open tickets with the ISP and Meraki on what fixed it. They agreed that was a valid workaround.   Just my experience.     ... View more

Really old post, just in case someone ends up here like I did. Just got a /31 WAN connection to work on an MX75 running 18.211.2   The trick for me was to set the subnet as a /24 255.255.255.0 with 8.8.8.8 DNS   Connected right up after that.       ... View more