ICMP类型名称和数值
时间：2009-05-31 来源：从未被和谐
echo-reply (0)
destination-unreachable (3)
network-unreachable
host-unreachable
protocol-unreachable
port-unreachable
fragmentation-needed
network-unknown
host-prohibited
source-quench (4)
redirect (5)
echo-request (8)
time-exceeded (10)
parameter-problem (11)
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