What is an Internet Device?
An
Internet device is any component that can be accessed via
the TCP/IP protocol. A device is defined by the type of service
it is (HTTP, SMTP, etc.) and it’s Domain Address (e.g.
www.AlertMeFirst.com). There are many different communication
methods, or protocols, that Internet devices use to communicate
to each other. The most common type of communication is HTTP,
but there are many others that are used as well. The type
of service you select will determine how the target host will
respond.
The Internet devices AlertMeFirst can monitor are:
|
Protocol
|
Full
Name
|
Port
|
What
the Protocol is Used For
|
| HTTP
v1.0 |
Hyper
Text Transfer Protocol |
80
|
This
is the protocol used for most Web sites. |
| HTTP
v1.1 |
Hyper
Text Transfer Protocol |
80
|
Same
as above but used on newer Web servers that host more
than one Web site with a single IP address. The Web hosting
server may be configured for one or the other. |
| HTTPS |
Hyper
Text Transfer Protocol Secure |
443
|
Communicates
to a Web server via Secure Sockets Layer (SSL) and is
used for secure communications. |
| FTP |
Network
News Transfer Protocol |
21
|
Commonly
used to transmit files over the Internet. |
| NNTP |
Network
News Transfer Protocol |
119
|
This
is a text-based protocol that is used to send and receive
Usenet news articles between a newsreader client and NNTP
server. |
| POP/POP3 |
Post
Office Protocol |
110
|
Used
to send and receive email messages through the Internet. |
| SMTP |
Simple
Mail Transfer Protocol |
25
|
Used
to send email messages over the Internet. |
| TELNET |
Tele-communications
Network |
23
|
This
is a protocol by which a person can "log in"
to a remote computer over the Internet and use it as if
they were operating a terminal locally. |
| DNS |
Domain
Name Service |
53
|
The
Internet method that translates domain names (such as
www.AlertMeFirst.com) to IP addresses (such as 207.35.25.242) |
| GOPHER |
GOPHER
(Developed at the University of Minnesota, the "gopher
state") |
70
|
Used
for the search and retrieval of documents through the
Internet but is now rarely used. |
| FINGER |
FINGER |
79
|
This
is a protocol that takes an email address and returns
information about the owner of that email address. |
| IMAP |
Internet
Message Access Protocol |
143
|
Used
for accessing email and bulletin board messages which
are stored exclusively on a server (there is no transfer
of files back and forth). |
| ICMP |
Internet
Control Message Protocol |
N/A
|
Commonly
called "ping", this service is different from
the others in that it is not formally a "protocol",
but rather a method by which a target server returns (or
"pings") a small text string back from the source
"pinger". This service does not use ports and
may even be blocked or dropped by some firewalls, servers
or routers. |
| Custom |
N/A |
Any
port
|
This
is a powerful service that gives you sweeping control
over the protocol send and response strings, as well
as the port number. With this service you can mimic
almost any TCP/IP protocol in existence today. The most
common uses of the custom service type are:
- monitoring
Web pages other than the default home page;
- monitoring
Web pages that access another site or database server
to make sure they are up and running;
- keyword
monitoring to ensure Web servers are not serving up
errors.
|
