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ping claims lost packets

I'm experiencing something very strange: running ping several times in a
row results in lost packets from ping's point of view, even though the
kernel is getting the echo replies back.

I can experience this on demand by running ping, with tcpdump running in
another window and watching for ICMP traffic. Leaving tcpdump running,
and stopping and restarting ping, often results in the stated behavior.
The replies keep coming back, but ping doesn't recognize them for
whatever reason.

Any ideas what could be wrong, and how to troubleshoot it further? I can
inspect deeper into the packets, if I had some idea of why ping (the
application) would discard what appears to be valid replies.

Re-Interpreting Historic Miracles with SED #141: %s/water/wine/g

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