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hping - [send_icmp] Unsupported icmp type

When performing tests you may sometimes want to send specially crafted icmp packets. hping is a handy tool for that.

However, the default behavior is to refuse to send "unsupported" Type/Code combinations. eg
hping3 -c 1 --icmp -C 33 -K 0 192.168.70.1
HPING 192.168.70.1 (wlan0 192.168.70.10): icmp mode set, 28 headers + 0 data bytes
[send_icmp] Unsupported icmp type!

Fortunately, there is an (undocumented) --force-icmp option that you can add to bypass the check:
hping3 -c 1 --icmp --force-icmp -C 33 -K 0 192.168.70.1
HPING 192.168.70.1 (wlan0 192.168.70.10): icmp mode set, 28 headers + 0 data bytes

--- 192.168.70.1 hping statistic ---
1 packets transmitted, 0 packets received, 100% packet loss
round-trip min/avg/max = 0.0/0.0/0.0 ms

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