home *** CD-ROM | disk | FTP | other *** search
- INTERNET
-
- The Internet is a worldwide meta-network comprising over 400 networks that
- are interconnected and share a common set of protocols for electronic mail
- and other data exchanges. The number of hosts has been estimated to be as
- high as 500,000.
-
- In the USA, the Internet is organized around the NSFNET (National Science
- Foundation Network), organized and partly funded by the US Government.
- NSFNET provides a "backbone" of 13 hubs connected by 1.5 million baud data
- lines, to which the mid-level networks are connected.
-
- The mid-level network to which Columbia is connected is NYSERNet, funded
- by universities, the State of New York, some companies, and the NSF.
- NYSERNet also has 1.5 million baud data lines between its major nodes,
- which include Columbia University, and NSFNET.
-
- Columbia hosts are also directly connected to BITNET (not part of the
- Internet). You can send and receive electronic mail easily by either
- network. Some other sites may be only on BITNET or only on the Internet
- (or neither), so you may or may not have a choice of routes.
-
-
- Electronic mail addresses on the Internet are written as userid@host.
- The host part is divided by dots (periods) into two or more parts.
-
- The host part conforms to the Domain Name System. The last part is the top
- level domain: indicating the USA origin of the system, the top level domain
- indicates the type of institution in the USA, and the country in the rest of
- the world. Probably you will see most often "edu", educational institution,
- and "com", commercial institution. The second-last part designates the
- individual site, and any other parts designate systems and even machine names
- at the site. You do not need to understand the meaning of a host name, but
- if it appears to use the Domain Name System, it is probably usable as an
- Internet address.
-
- The Internet hostname for cunixa-cunixf is <machine>.cc.columbia.edu. Thus
- for the user jb51 on cunixf (faculty-staff mail) the address is:
- jb51@cunixf.cc.columbia.edu
-
- This is the best form in which to give your address. It can be used in this
- form from anywhere on the Internet and on some other networks, and otherwise
- a usable address can be constructed from it.
-
-
- For some additional information on the Internet, see the files in the
- directory /usr/local/doc/internet.
-
- The file interest-groups.txt describes discussion groups that
- communicate by electronic mail. This is a long file; read it with
- emacs and use control-s to search for items of possible interest.
-
- The subdirectory resource-guide.txt contains a guidebook to some Internet
- resources. It is not a general introduction to the Internet and
- is not easy to read online.
-
- The file transfer system on the Internet is ftp. Some sites offer "anonymous
- ftp", in which anyone can connect as "anonymous" and transfer certain files.
- For more information, type "man ftp" at the shell prompt.
-
- You can log in to other hosts (if you have an account) via the network by
- using telnet. For more information, type "man telnet" at the shell prompt.
-
- See also "help bitnet" and "help addressing".
-