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I have 2 Hyper-V VMs on the same host - one is XP and the other Windows 8.1.

They both have a virtual network adapter with the same VLAN ID value.

The firewall is switched off on both VMs.

I can ping the XP VM from the Win8.1 VM, but I can't ping the Win8.1 VM from the XP VM.

What else do I need to check? enter image description here

Traceroute from XP as follows: enter image description here

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    Why does your Windows XP VM have two virtual NICs that appear to be on the same subnet? – Michael Hampton Apr 7 '18 at 21:38
  • @MichaelHampton I don't know - is that bad? – CompanyDroneFromSector7G Apr 7 '18 at 21:51
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    It's the most likely cause of the problem, so yes, you should look into why that is, and most likely fix it. – Michael Hampton Apr 7 '18 at 21:53
  • I've deleted the second NIC and now it works. Thanks for the help! – CompanyDroneFromSector7G Apr 7 '18 at 22:29
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Windows XP VM has another adapter from the same subnet.

Try to remove it or change the subnet there.

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