I have set up a 6in4 tunnel, namely "sit1", but I have discovered that if I traceroute non exist IP within the subnet, it will loop. What should I do to solve this?
The routing table:
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The tunnel is a point-to-point interface, all packets sent over the tunnel are received and processed by the remote device. When the remote device realizes the packet is destined for a subnet-local address it sends it back across the tunnel to your Microtik. You are hitting a the ping-pong vulnerability in IPv6.