To add on what is already said: If PPPoE is used on the WAN, the MTU is automatically adjusted for the overhead If you need a different WAN MTU, Support can set this for you. But this reduced MTU is not accounted for when using non-Meraki IPsec VPNs and you will certainly run into problems.
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I just had a different type of issue but similar. Our Provider refused to change from hard coding to Auto/auto I was seeing 2 to 3 % packet drops every 20 to 30 mins. They were seeing the errors on the client-facing side of the ENID. it wasn't till we made them replace the ENID and the new one was left on Auto / Auto did the issue resolve. Seems the MX 100 did not like being hard coding with this provider. Or is using the Hard code something MX units don't handle well?
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