12-20-2012
Yes, Provider = ISP
c.f. $ man dhclient
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LEARN ABOUT NETBSD
networks
NETWORKS(5) BSD File Formats Manual NETWORKS(5)
NAME
networks -- Internet Protocol network name data base
DESCRIPTION
The networks file is used as a local source to translate between Internet Protocol (IP) network addresses and network names (and vice versa).
It can be used in conjunction with the DNS, as controlled by nsswitch.conf(5).
While the networks file was originally intended to be an exhaustive list of all IP networks that the local host could communicate with, dis-
tribution and update of such a list for the world-wide Internet (or, indeed, for any large "enterprise" network) has proven to be prohibi-
tive, so the Domain Name System (DNS) is used instead, except as noted.
For each IP network a single line should be present with the following information:
name network [alias ...]
These are:
name Official network name
network IP network number
alias Network alias
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.
Network number may be specified in the conventional dot (``.'') notation using the inet_network(3) routine from the IP address manipulation
library, inet(3). Network names may contain "a" through "z", zero through nine, and dash.
IP network numbers on the Internet are generally assigned to a site by its Internet Service Provider (ISP), who, in turn, get network address
space assigned to them by one of the regional Internet Registries (e.g. ARIN, RIPE NCC, APNIC). These registries, in turn, answer to the
Internet Assigned Numbers Authority (IANA).
If a site changes its ISP from one to another, it will generally be required to change all its assigned IP addresses as part of the conver-
sion; that is, return the previous network numbers to the previous ISP, and assign addresses to its hosts from IP network address space given
by the new ISP. Thus, it is best for a savvy network manager to configure his hosts for easy renumbering, to preserve his ability to easily
change his ISP should the need arise.
FILES
/etc/networks The networks file resides in /etc.
SEE ALSO
getnetent(3), nsswitch.conf(5), resolv.conf(5), hostname(7), dhclient(8), dhcpd(8), named(8)
Classless IN-ADDR.ARPA delegation, RFC 2317, March 1998.
Address Allocation for Private Internets, RFC 1918, February 1996.
Network 10 Considered Harmful, RFC 1627, July 1994.
Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation Strategy, RFC 1519, September 1993.
DNS Encoding of Network Names and Other Types, RFC 1101, April 1989.
HISTORY
The networks file format appeared in 4.2BSD.
BSD
November 17, 2000 BSD