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White Pages file:///D|/Documents%20and%20Settings/bigini/Documenti/homenet2run/tcpip/tcp-ip-illustrated/other.htm (4 of 11) [12/09/2001 14.47.58] Chapter 30. Other TCP/IP Applications Using the VRFY command of SMTP, along with the Finger protocol and the Whois protocol
to locate users on the Internet is similar to using the white pages of a telephone book to find
someone's phone number. At the present time ad hoc tools such as these are all that's widely
available, but research is under way to improve this type of service.
[Schwartz and Tsirigotis 1991] contains additional information on various white pages
services being tried on the Internet. The particular tool, called Netfind, can be accessed by
using Telnet to either bruno.cs.colorado.edu or ds.internic.net and logging
in as netfind.
RFC 1309 [Weider, Reynolds, and Heker 1992] provides an overview of the OSI directory
service, called X.500, and compares and contrasts it with current Internet techniques (Finger
and Whois). 30.4 Archie, WAIS, Gopher, Veronica, and WWW
The tools that we described in the previous two sections-Finger, Whois, and a white pages
service-are for locating information on people. Other tools exist to locate files and
documents, and this section gives an overview of these tools. We only provide an overview,
because examining the details of each tool is beyond the scope of this book. Methods are
given for accessing these tools across the Internet, and you are encouraged to do so, to find
which tool can help you. Additional tools are continually being developed. [Obraczka,
Danzig, and Li 1993] provide an overview of resource discovery services on the Internet.
Many of the resources used in this text were obtained using anonymous FTP. The problem is
finding which FTP site has the program we want. Sometimes we don't even know the exact
filename, but we know some keywords that probably appear in the filename.
Archie provides a directory of thousands of FTP servers across the Internet. We can access
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This test prep was uploaded on 04/04/2014 for the course ECE EL5373 taught by Professor Guoyang during the Spring '12 term at NYU Poly.
- Spring '12