248 days uptime is bad for a Mikrotik running RouterOS below 6.34

November 14, 2016

I’ve some info for you, if you’re running Mikrotik RouterOS in a version below 6.34rc45 and are using a tunnel (like IPIP over IPsec). If you don’t boot the router for about 248 days, your router will get inaccessible. This is specially bad if your routers are in remote locations and you’ve got multiple routers with the same updates ( like > 100 😉 ) as you did the firmware update at the same time.

The changelog for the 6.34rc45 version states the problem, but it doesn’t tell you that the router is offline and can only be accessed via serial cable.

*) tunnel – fix complaining about loop after ~248 days;

If you look into the log via the serial port you’ll see

07:21:13 interface,info tunnel_1 link down
07:21:13 interface,info tunnel_2 link down
07:21:13 interface,info tunnel_3 link down
07:21:13 interface,info tunnel_4 link down
07:21:14 interface,warning tunnel_1 transmit loop detected, downing interface for 60 seconds
07:21:14 interface,warning tunnel_2 transmit loop detected, downing interface for 60 seconds
07:21:14 interface,warning tunnel_3 transmit loop detected, downing interface for 60 seconds
07:21:14 interface,warning tunnel_4 transmit loop detected, downing interface for 60 seconds

and nothing else. 😉

If you’re running an affected version you need to reboot before reaching 35 weeks or upgrade to a new version.

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