Everything sure is correct, because if they use a different internet connection even cellular one, they just work fine . I don't even know where to troubleshoot .   To let you know the router making the pptp is a Mikrotik router .   The ping could go fine up to 1500 packet size  ... View more

Correct ! we can't learn the routes through the autovpn, and you are right about the MTU I went here just to get someone reaching this level, though .. the pptp tunnel handles 1450 Byte MTU that is correct, but I have used MRRU to increase the data that could be transmitted on the tunnel to 1600 Bytes, so I can easily ping packets with 1472 Byte size normally now .   Yet the issue is still the same we can't learn routes, I was thinking to change the MTU size by contacting Meraki but I don't have access to the customer's portal, and I think the mrru is enough to fix the issue over the pptp link .   What do you think ? ... View more

No, its not a 3rd party VPN, but the internet that feeds the Meraki itself is a tunneled internet, so Meraki shoudn't have any idea about that .   Everything in the Meraki MX is just the usual configuration default settings . ... View more