36 lines
929 B
Groff
36 lines
929 B
Groff
.Dd June 4, 2017
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.Dt ICMP 4
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.Os
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.Sh NAME
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.Nm icmp
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.Nd internet control message protocol
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.Sh SYNOPSIS
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.In sys/socket.h
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.In netinet/in.h
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.Sh DESCRIPTION
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The Internet Control Message Protocol (ICMP) is a control and error reporting
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layer for the Internet Protocol version 4
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.Xr ip 4 .
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ICMP is commonly used to diagnose network problems, such as the destination
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being unreachable, network congestion, packets exceeding their time to live, and
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so on.
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.Sh SEE ALSO
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.Xr inet 4 ,
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.Xr ip 4 ,
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.Xr ping 4 ,
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.Xr kernel 7
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.Sh STANDARDS
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.Rs
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.%A J. Postel (ed.)
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.%D September 1981
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.%R STD 5
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.%R RFC 792
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.%T Internet Control Message Protocol - DARPA Internet Program Protocol Specification
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.%Q USC/Information Sciences Institute
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.Re
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.Sh BUGS
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ICMP is not implemented yet, except automatically replying to the Echo Request
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message (ping) and the existence of
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.Xr ping 4
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sockets for sending Echo Request messages and receiving Echo Reply messages.
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