<p>Does <code>ping www.heise.de</code> from the same host work?  Does <code>check_ping -4 -H www.heise.de -w '200,20%' -c '500,50%'</code> solve the problem?</p>

<p>Either way, you might want to use <code>check_icmp</code> (which currently doesn't support ICMPv6) to work around the issue (and because it's preferable for v4 checks anyway).</p>

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