Think i've cracked it 🙂 the only thing i kept thinking could be wrong was the ACL's somewhere.. After a very long look through the ACL list on the 2911 router i noticed the top ACL which maps to another crypto map there was this  permit ip 172.21.0.0 0.0.0.255 192.168.0.0 0.255.255.255    And on my new ACL for my new crypto map i had 192.168.128.0/24, therefore there was an overlap.    Which evidently meant that the packet was coming in hitting the wrong ACL and therefore hitting the wrong crypto map. Which would explain why I was getting peer address not found.    I've done a ping across the tunnel from Meraki now and can see traffic both ways now.   Thanks for your help ... View more