Tunnel not stable#

Unanswered Question
Jul 25th, 2009

Hi,

My Setup is site-2-site VPN with mix of GRE with IPSEC Tunnel and IPSEC Tunnel.

Routing protocol is OSPF

All Sites are connecting to HQ

HQ to Site A

HQ to Site B

HQ to Site C

HQ to Site D

Some of the Tunnels are not stable, I suspect overlapping of network or could be another issue. But Working hours all looks OK.

How can i verify overlapping issues, if overlapping occurs how to overcome.

I have this problem too.
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tstanik Thu, 07/30/2009 - 16:32

If you are unable to access the internal network after the tunnel establishment, check the IP address assigned to the VPN client that overlaps with the internal network behind the head-end device.

Solution 1

Always make sure that the IP addresses in the pool to be assigned for the VPN clients, the internal network of the head-end device and the VPN Client internal network must be in different networks. You can assign the same major network with different subnets, but sometimes the routing issues occur.

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