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For ICMP rules, the "protocol" and "port" fields are repurposed to represent the ICMP types and codes. For ping to work, you will need to allow ICMP echo request (in) and echo response (out, if you're filtering outbound traffic).
See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/security-group-rules-reference.html#sg-rules-ping for example.
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