You need to provide some significant clarification on your topology, as the way it is worded, there is a ton of ambiguity on a number of key areas. 1. You say you have an "upstream DHCP Server pool". Provide some more details on this. You are not using the MX for DHCP? 2. You say you are using the Meraki DNS servers. There are no Meraki-specific DNS servers, the device, if it is handling DHCP, will either proxy or relay your ISP's DNS servers, or allow you to select Cisco's Umbrella or Google DNS. 3. Your mention of the MX84 being .2 while you mention .1 being dowstream, you need to provide some clarification here. Which IP is handling NAT/PAT? Or are you using the MX in transparent mode? A diagram of your topology or even a rough overview would greatly aide in providing some much needed clarity on your setup, and subsequently allow for far more productive feedback.
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