15:28:48.734661 IP 172.17.0.5 > 8.8.8.8: ICMP echo request, id 33313, seq 
41979, length 36
        0x0000:  4500 0038 f40e 4000 4001 8a90 ac11 0005  E..8..@.@.......
        0x0010:  0808 0808 0800 7648 8221 a3fb 5072 6f6d  ......vH.!..Prom
        0x0020:  6574 6865 7573 2042 6c61 636b 626f 7820  etheus.Blackbox.
        0x0030:  4578 706f 7274 6572                      Exporter


FWIW, I've recalculated the IP and ICMP checksums, and both appear to be 
correct.

You're definitely sure the packets are leaving the machine?  Can you try a 
blackbox test of some remote host or VM on the Internet that you control, 
and run tcpdump there to check for incoming ICMP?

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