38 lines
750 B
Groff
38 lines
750 B
Groff
.Dd May 27, 2017
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.Dt LO 4
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.Os
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.Sh NAME
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.Nm lo
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.Nd loopback network interface
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.Sh SYNOPSIS
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.Nm /dev/lo Ns Ar X
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.Sh DESCRIPTION
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.Nm
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is a loopback network interface that receives what is sent on it, used for
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communication within the local host.
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.Nm
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is implemented in software and the packets sent on it are not transmitted on the
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network.
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.Pp
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The
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.Xr kernel 7
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creates the
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.Sy lo0
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network interface on boot and configures it with the
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.Xr inet 4
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address
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.Dv 127.0.0.1
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in the subnet
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.Dv 127.0.0.0/8 .
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Packets with source or destination outside this subnet are dropped.
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.Sh SEE ALSO
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.Xr kernel 7 ,
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.Xr ifconfig 8
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.Sh CAVEATS
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The default
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.Xr inet 4
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configuration
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of the
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.Sy lo0
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network interface must not be changed or local loopback communication may fail.
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