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Destination host unreachable

Please help if you can.  I presume I am having some DNS related problems but I don't know how to troubleshoot or fix. I have setup a Hamachi network between two laptops (eg. laptop1 and laptop2). To test the network I placed the laptop that created the network (eg. laptop1) onto a mobile hotspot internet connection and started running ping tests. 

 

The Hamachi generated IP addresses ping perfectly and the laptop on the hotspot (laptop1) can ping laptop2 by hostname. Although the replies are from IPv6 address which I thought was odd, but probably isn't.

The problem, laptop2 cannot ping laptop1 by hostname, it returns: Reply from [it's own wifi ip address] Destination host unreachable.

 

Any help would be greatly appreciated.