How to send Ping6 request using Java library (JpCap)?

I have encountered the same problem. And I have already set the ipv6 preferred in the configure files. But the problem still exists.

And my PC is xp operate system.

I don't know JpCap, but for me it looks like you are creating an IPv4 IPPacket and an IPv6 ICMPPacket. You are using setIPv4Parameter() on the IPPacket and specify the destination address using an IPv4 address. I doubt that it is possible to send an the IPv6 ICMPPacket like that.

In windows seven do following to enable (if available) ipv6 for network interface.

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