|
FEATURE 1
Achieving a Complete Understanding of ICMP, One of the Internet’s
Support Protocols
- ICMP is indispensable for controlling Internet protocols. It is
a very convenient and highly important protocol, but we do not normally
see it. We can study the mechanism of ICMP by examining its basics,
specific examples of its implementation, and its connection to Internet
security.
Basics: ICMP is like a carrier pigeon that transports control
information to the source of IP packets
Implementation: The commonly used Ping Command is an example
of ICMP implemented on Operating Systems, TCP/IP software, or application
software; we strive for an understanding of the “functions”
of ICMP, which RFC does not have
- We look at ICMP processing in Windows-based computers, Ping command,
Traceroute command, and Port scan
Operation: The use of ICMP should be based on a well-balanced
relationship between convenience and security
Reference Data: All ICMP messages are compiled to help you achieve
a full understanding of ICMP
Boxed Article: IPv6 actively utilizes ICMP
FEATURE 2
A Thorough Examination of Instant Messaging
The mechanism of the third major application, after the World Wide
Web and e-mail
- Instant messaging software has advantages on both phone and e-mail
systems. Before sending a message, you can confirm whether or not the
person to whom you want to send the message is using his or her computer
at that moment.
There is a prevailing image of IM software being used by individuals
strictly for fun, but it can also be used to conduct business. This
article examines, in detail, the mechanism of this surprisingly little-known
software, how to use it, and its future prospects.
Part 1 - Mechanism: A message is sent directly or via a server,
depending on the type of software being used or its function
- We look at the management of present information, exchange of messages,
file transfer and chat, and sharing applications
Boxed Article: There are cases in which a message is not sent
via a server
Part 2 - Actual Use: When there is a router or a proxy, a mechanism
is needed for going beyond
Part 3 - Outlook: In the future, instant messaging software will
deal not only with present information on the user or person at the
other end but with various other matters as well, including the status
of devices such as printers or the availability of a conference room,
and the infrastructure for interconnection will be established
|
