Our KVM virtualization platform does not natively support IPv6. The most widely adopted IPv6 networking technique on KVM platform requires using the host node as the primary gateway, which is not possible in our environment due to security considerations. We are still working on a possible solution, though there is no ETA at the moment.
However you are welcome to use an ipv6 tunnel, such as https://tunnelbroker.net/ - it works very well in a KVM VPS.
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If your request was not properly addressed, please reply in this ticket and one of our engineers will take a look.