We have a PPTP tunnel towards a datacenter we own, the tunnel is made in a router towards our datacenter, the Meraki is connected to that router and all of the internet is actually comin through that PPTP tunnel .
The Ipsec connects but doesn't learn any routes .. what might the problem be ?
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 .