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- DoD ICMP
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- This packet is carrying diagnostic
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- information between an IP gateway and a
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- node on the network that transmitted an
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- IP packet. For example, an Internet
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- Control Message Protocol (ICMP) packet
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- may be generated when an IP packet
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- cannot reach its destination or when the
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- gateway informs the node that IP packets
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- can be sent using shorter internetwork
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- routes. ICMP packets are important
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- network debugging packets!
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