For the last few months, we have been having problems with our S2S VPN connection between all our Meraki sites and our Cisco Firepower 2110. We use IKEv1 (because, for the longest time, Meraki didn't support IKEv2), and every morning, certain networks would stop passing traffic from our Cisco FTD to our Meraki sites. In order to, temporarily, resolve this, we would ping each Meraki locations' primary IP address, and the tunnel would reestablish. This would last the rest of the day.   Half of our networks reestablish with no issues (VoIP VLAN, Primary VLAN, Security VLAN, etc.), but two of our newer networks (Servers and New Default DHCP) have continuous problems (which, of course, both of these networks control the users' ability to sign in and authenticate properly).   I opened up a case with support and was told to move to IKEv2. Last night, I did just that, and now our "trouble networks" are behaving even worse. About every 10 minutes, a critical network from our Cisco FTD would stop passing traffic to all Meraki sites. I created a constant ping to all these locations, but it, clearly, wasn't working.   We are running on version MR 30.6 and MS/CS 16.8 for our Meraki equipment and 7.4.2.1-30 on our Cisco FTD.   So here is my question: Has anyone else had a problem like this? If so, how did you resolve it? ... View more