First check in - not complete! The ifup script is functional though.

SRC/network.conf.5

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+.TH network.conf 5 "May 2017" "iftools" "File formats"
+.SH NAME
+/etc/network.conf \- network interface configuration for iftools
+.SH DESCRIPTION
+/etc/network.conf contains network interface configuration
+information for the
+.BR ifup (8)
+and
+.BR ifdown (8)
+commands.
+This is where you configure how your system is connected to the network.
+.P
+Lines starting with `#' are ignored. Note that end-of-line comments are
+NOT supported, comments must be on a line of their own.
+.P
+The file consists of any number of "iface",  "auto", and
+.nh
+"source\-directory" stanzas. Here is an example:
+.P
+.RS
+.EX
+auto eth0
+iface eth0 inet static
+ 	address 192.168.1.10
+ 	netmask 255.255.255.0
+	gateway 192.168.1.1
+
+iface eth1 inet dhcp
+
+iface eth1:1
+	address 192.168.1.2
+	netmask 255.255.255.0
+
+source-directory network.d
+.EE
+.RE
+.P
+Lines beginning with the word "auto" are used to identify the physical
+interfaces to be brought up when
+.B ifup
+is run with the
+.B \-a
+option.  (This option is used by the system boot scripts.)
+There can be multiple "auto" stanzas.
+.B ifup
+brings the named interfaces up in the order listed.
+.P
+Lines beginning with "source-directory" are used to source multiple
+files at once. All non-dotted files within the directory are sourced
+in lexical order.
+.P
+When sourcing directories, if a path doesn't have a leading slash
+it's considered relative to the directory containing the network.conf
+file (/etc). In the example above, files in /etc/network.d are sourced.
+.P
+By default, on a freshly installed system, the network.conf file includes
+a line to source files in the
+.IR /etc/network.d
+directory.
+.P
+Stanzas defining logical interfaces start with a line consisting of the
+word "iface" followed by the name of the logical interface. The name
+should be the name of the physical interface, a colon, and the logical
+name. This is shown in the example above as eth1:1.
+.P
+Additional options can be given on subsequent lines in the stanza.
+Options are usually indented for clarity (as in the example above)
+but are not required to be.
+.P
+.SH OPTIONS
+The following additional options are available:
+.TP
+.BR macaddr " XX:XX:XX:XX:XX:XX"
+Set the MAC address to be used by a physical interface. This option
+cannot be applied to logical interfaces.
+.TP
+.BR route " [NETWORK|IP] " via " [GATEWAY]"
+Specify a gateway for a particular network or IP address. The network
+or IP address can be specified in CIDR notation. This option is also
+only available for physical devices.
+.SH AUTHOR
+iftools was written by Jay Larson <jlarson@snaplinux.org>. The functionality is
+loosely based on the ifupdown suite written by Anthony Towns <aj@azure.humbug.org.au>.
+.SH "SEE ALSO"
+.BR ifup (8),
+.BR ip (8),
+.BR ifconfig (8),
+.BR run\-parts (8),
+.BR resolvconf (8).