I am Running a network is 20 branches connected to a central office , all our routers are Mikrotik, the Central Office router is RB3011. Branch routers are a mix of multiple routers, but all Mikrotik.
All routers updated to the Latest Long Term Release .
The Central and Remote offices are connected with IPIP tunnels with IPsec, and OSPF. Every Remote branch is directly connected to central office and all branches are connected in a ring structure, so every remote is connted with 2 other branches .
The total setup perfect with out any problems except the IPIP interfaces go offline after a few hours like 10 hrs , some times 6 to 7 hours . The Flag 'R' on the IPiP interface goes away , but I noticed the IPsec policy still shows established. No mater what I do , like disable and re-enable , flush the IPsec , nothing brings back the IPIP tunnel to Running state , but If I reboot the router , the IPIP comes back up and works with out any problem .
This happens randomly on all routers some Times, never happen in a full 24 hours . Happens more frequently on The central router RB3011.
Can anyone shed any light on this , why this might be happening.