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# ICMPv4 protocol
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---
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protocol: &icmpv4
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name: icmpv4
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longname: Internet Control Message Protocol
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osilayer: 3
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fields:
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- field: type
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length: 1
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- field: code
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length: 1
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- field: checksum
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length: 2
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- field: roh
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desc: rest of header
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length: 4
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- field: data
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optional: true |