Weird issue which I can't seem to diagnose. I have a site-to-site IPIP tunnel with IPsec between a RB1100AHx2 and a RB951G.
On the RB1100AHx2 the log shows 30s after the tunnel interface is up, the interface is going down. 30s later the tunnel is up again:
Code: Select all
13:31:21 interface,info ipip3 link up
13:31:51 interface,info ipip3 link down
13:32:21 interface,info ipip3 link up
13:32:51 interface,info ipip3 link down
13:33:21 interface,info ipip3 link up
13:33:51 interface,info ipip3 link down
13:34:21 interface,info ipip3 link up
13:34:51 interface,info ipip3 link down
13:35:21 interface,info ipip3 link up
13:35:51 interface,info ipip3 link down
13:36:21 interface,info ipip3 link up
13:36:51 interface,info ipip3 link down
13:37:21 interface,info ipip3 link up
13:37:51 interface,info ipip3 link down
13:38:21 interface,info ipip3 link up
13:38:51 interface,info ipip3 link down
13:39:21 interface,info ipip3 link up
13:39:51 interface,info ipip3 link down
13:40:21 interface,info ipip3 link up
13:40:51 interface,info ipip3 link down
13:41:21 interface,info ipip3 link up
13:41:51 interface,info ipip3 link down
13:42:21 interface,info ipip3 link up
13:42:51 interface,info ipip3 link down
13:43:21 interface,info ipip3 link up
13:43:51 interface,info ipip3 link down
13:44:21 interface,info ipip3 link up
13:44:51 interface,info ipip3 link down
13:45:21 interface,info ipip3 link up
13:45:51 interface,info ipip3 link down
13:46:21 interface,info ipip3 link up
13:46:51 interface,info ipip3 link down
Both devices are running RouterOS 6.22. During the time the tunnel is down, no traffic is passing through the tunnel. When the tunnel is up traffic is flowing without a problem. When keeping traffic running (e.g. having a Winbox connection established or having a ping running) the tunnel is staying up. Tried lowering the MTU from 1480 to 1380 to no avail. Clocks are synched. IPIP and IPsec configs are double checked and match (opposite of course).
On the RB1100AHx2 I have multiple tunnels running with a similar configuration to various other devices (another RB1100AHx2, an EdgeRouter Lite) which do not seem to be affected.
Any ideas?
