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ICMP Parameter
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icmp_wroff_extra RW min = 0
max = 128
default = 32
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max = 255
default = 255
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icmp_ipv6_hoplimit RW min = 1
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icmp_bsd_compat RW min = 0
max = 1
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max = 65536
default = 8192
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icmp_xmit_lowat RW min = 0
max = 65536
default = 1024
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icmp_recv_hiwat RW min = 4096
max = 65536
default = 8192
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icmp_max_buf RW min = 65536
max = (1024*1024*1024) = 1073741824
default = (256*1024) = 262144
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