Hello learned NZNOG-folks, Many of you have been working hands-on with IPv6 a lot more than I have, so i'll ask this here. In two cases, on two discrete systems, both Windows clients (one a Windows 7 workstation, the other a Windows 2008R2 server) a 'ping'[1] is run against a hostname. In both cases a ping against a v6 IP address is tried (and failed, as the host has no v6 connectivity - and in at least one case, v6 is actually disabled in the network interface settings). A simple 'nslookup' check without specifying the query type returns both IPv6 and IPv4 responses for the hostname. So why is the client trying to ping a v6 address when it has no v6 connectivity? (and for the record, an answer of 'make v6 work' doesn't solve my problem, as much as it might be a simple resolution.) Cheers Mark. [1] as you can probably guess, ping isn't actually the end-use of this connectivity, but it was the first troubleshooting measure used. This is impacting on application-layer connectivity, so 'use-v4-only' ping syntax also doesn't help me. :-)