<p>When  using check_ping to check a dual-stacked website (e.g. <a href="http://www.heise.de">www.heise.de</a>) from a host that has IPv6 enabled but no global IPv6 address check_ping will fail (Network unreachable).</p>

<p>Please consider implementing RFC 6724 (Default Address Selection for Internet Protocol Version 6 (IPv6)) for check_ping.  </p>

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