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Why would my computer (Vista Business) begin to start pinging using IPv6? I have not to my knowledge made any change to enable this.

When I ping a local computer with it's hostname, ping has started to display the IP6 address it resolves to and not the IPv4 address.

Any ideas?

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Because computer can understand only numbers and not name like ( 0 and 1).And also when you work on domain there is a Reverse Look-up zone which has done this function. – user94341 Aug 16 '11 at 9:31

It's probably because when ping looks up the hostname your DNS returns an ip6 address. Check with whomever is in charge of your DNS server.

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Just go to network card properties, uncheck the IPV6 address option and restart the machine. default ping to hostname will resolve to ipv4 address.

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Not an answer to the question which is just "why". Also you will want IPv6 support when possible. – MDeSchaepmeester Jul 31 '14 at 21:19

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