IPIP with IPSec stays down after internet outage

RouterOS General
1

Hello everyone,

I have a problem with two IPIP tunnels with IPsec in a Mikrotik. We have two sites, both with a second internet connection, so there is a backup connection when the main goes down. There is an IPIP tunnel between the main connections of both sites and a IPIP tunnel between the backup connections.

Site A Main IP <– IPIP –> Site B Main IP
Site A Backup IP <– IPIP –> Site B Backup IP

Site A is an Mikrotik RB4011, Site B is an Mikrotik RB3011. In both routers there is een static route, so the second tunnel goes over the backup connection.

Normaly the IPIP tunnels works correctly, but when there was a outage of the PPPoE and the connection is back again, the IPIP tunnel stays down. I tried the following:

  • Clearing connection tracking
  • Flush IPsec SA
  • Disable / enable IPIP

Only a reboot of the Mikrotik router works. Then the tunnel is up directly. Also when I disable IPSec encryption, the tunnel goes up.

Does anyone recognise this problem? Thanks in advance!

Regards,
KoffieKopje

2

I’d have to see exports of both side’s configurations. See my automatic signature below for anonymisation hints.

3

In the attachments you will see the export of the routers.
Site-B.rsc (6.46 KB)
Site-A.rsc (7.28 KB)

4

Hello,
same problem over here, colud you solve it?
Thnk