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Beginner

Strange tunnel behaviour

Hello. We have 4 tunnels which is act very strangely. Whole point is tunnels will not coming up until PC which are connected to that router will boot. This situation only occuring with 4 tunnels and i dont see any differences in routers configs. Is there any specific config options causing this?

3 REPLIES 3
VIP Mentor

Re: Strange tunnel behaviour

Hello,

 

post the configs of the tunnels and the devices the tunnels are configured on. 

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Hall of Fame Master

Re: Strange tunnel behaviour

I agree with @Georg Pauwen that we need more information to help us understand the problem. In addition to the configs it might be helpful to have a diagram and a description of the environment. What kind of tunnels are these? If it turns out that these are ipsec tunnels then the symptoms might make sense. ipsec will not negotiate and bring a tunnel up until there is "interesting" traffic (traffic that matches the acl for selecting traffic to encrypt). It is quite possible that there is not interesting traffic until the PC boots.

 

HTH

 

Rick

VIP Advocate

Re: Strange tunnel behaviour

Hi,

Are you talking about the GRE tunnel?

Under normal circumstances, there are only three reasons for a GRE tunnel to be in the up/down state:  

  • There is no route, which includes the default route, to the tunnel destination address.
  • The interface that anchors the tunnel source is down.
  • The route to the tunnel destination address is through the tunnel itself, which results in recursion

Can you share a router configuration so we can examine configuration? 

 

Regards,
Deepak Kumar,
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