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L2TP Server Binding + Dynamic L2TP Interface duplication

Wed Oct 12, 2016 6:41 pm

RouterOS: 6.34.6
Model: CCR1036-12G-4S

I use L2TP Server binding to link a username to an interface so that I can add the interface as part of a VRF and apply routes to it.

Problem:
Normally when the client connects and authenticates, it is attached to the L2TP Server Binding interface successfully and life is good. Sometimes the remote clients router is rebooted and re-connects before the L2TP interface has timed out, and automatically creates a Dynamic interface since there is already an active Server Binding interface. The L2TP profile is set to only allow 1 active client, but I am not sure why Mikrotik is not stopping the dynamic interface from being created and only reconnecting once the original L2TP Service Binding interface times out. This creates an issue where the new dynamic interface is not part of the VRF and therefore the connection may seem up, but there is no routing for it.

So... How does one stop the router from adding a dynamic l2tp interface and only accept the connections using the l2tp server binding interface when it is linked to a client.
MTCNA, MTCRE, MTCINE, MTCTCE, MTCIPv6E, MTCUME
 
jarda
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Joined: Mon Oct 22, 2012 4:46 pm

Re: L2TP Server Binding + Dynamic L2TP Interface duplication

Mon Oct 17, 2016 10:50 am

Well. I observe the same behaviour time to time also. It is definitely a bug, I thought to implement some dynamic binding removal script, as removing it is enough to get the client reconnected to static binding immediately again. But I have not seen this behaviour with 6.37 so far, so no actions was taken yet.
 
dendzo
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Joined: Mon Aug 05, 2013 11:39 pm

Re: L2TP Server Binding + Dynamic L2TP Interface duplication

Wed Jul 04, 2018 5:34 pm

I started seeing this for the past few months. I'm running 6.42.1. Anyone else has this issue?
 
jarda
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Re: L2TP Server Binding + Dynamic L2TP Interface duplication

Sun Sep 23, 2018 11:33 am

I can confirm I see it even with 6.43.x. Again time to time.
 
nalafod
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Joined: Thu Sep 20, 2018 2:44 pm

Re: L2TP Server Binding + Dynamic L2TP Interface duplication

Sat Jul 27, 2019 12:59 am

Is this issue resolved ?

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