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Probably it would be best to port the gathering, archiving, analysis, prsentation code to another site for modification to support IPv6. For some information on portingthe code see PingER#PortingPingERArchivetoNUST.
Hints
An IPv6 host is ipv6.google.com(2001:4860:800f::68)
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The Linux online manual has a very useful chapter on IPv6-ready test/debug programs