12-19-2017
Possibly the system has run out of network buffer resources. Has the load/number of users been steadily increasing?
Network configurations determine the number of buffers available for network packets (of various different sizes) arriving and departing, and also the maximum number of connections.
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NETWORKS(5) File Formats Manual NETWORKS(5)
NAME
networks - network name data base
DESCRIPTION
The networks file contains information regarding the known networks which comprise the DARPA Internet. For each network a single line
should be present with the following information:
official network name
network number
aliases
Items are separated by any number of blanks and/or tab characters. A ``#'' indicates the beginning of a comment; characters up to the end
of the line are not interpreted by routines which search the file. This file is normally created from the official network data base main-
tained at the Network Information Control Center (NIC), though local changes may be required to bring it up to date regarding unofficial
aliases and/or unknown networks.
Network number may be specified in the conventional ``.'' notation using the inet_network() routine from the Internet address manipulation
library, inet(3N). Network names may contain any printable character other than a field delimiter, newline, or comment character.
FILES
/etc/networks
SEE ALSO
getnetent(3N)
BUGS
A name server should be used instead of a static file.
4.2 Berkeley Distribution May 6, 1986 NETWORKS(5)