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04 TCP-IP |
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04 TCP-IP |
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This article is from the Amiga Networking FAQ, by Richard Norman with numerous contributions by others.
TCP-IP is a protocol that has been released as a standard which means that
vendors can implement it independently and freely and yet it still works. The
standard is defined and described in RFC documents which are available
electronically. Lots of free source code and the ability to use it royalty free
make TCP/IP attractive to vendors. It has been implemented by a large number of
different vendors and therefore is popular on the Internet. For more information
on the Internet and TCP-IP concepts see ZEN
TCP/IP as the name implies is more than one layer. The IP layer takes care of the
lowest layers of the protocol and is responsible for talking to the device drivers
(data link layers). The TCP is one of two "transport" layer protocols which
handles the packetizing of the data. TCP is a reliable service because it insures
that the packets are put back into the right order and that they are all received.
If you send packets "a", "b", "c", then TCP will make sure they are received as
"abc" and not "bca".
UDP is the other transport protocol and it is unreliable, but has less overhead.
The applications ride on these lower protocol layers. There are a number of
applications defined in the TCP/IP standards, but vendors are only required to
supply the lower layers. See the applications section for a partial list of
TCP/IP applications. For instructions on using the FTP application see the
FTP FAQ
TCP/IP standard also provides for programming hooks which can use ports and
sockets to allow programs to talk to one another over the network. The World Wide
Web (WWW) and Internet Relay Chat (IRC) are two examples of how these hooks can
be exploited. Any programmer can use these hooks for their own programs.
See the software by category section for a list of Amiga implementations of
TCP/IP.
Q) DECnet
DECnet is a proprietary standard belonging to DEC which is also made up layers in
a similar manner to TCP/IP. They break up the job quite a bit differently. For
instance with DECnet there is no need for a separate NFS application. You can see
a remote nodes disk drives by simply including the DECnet node name in the
directory command. DECnet has two ways of handling terminal traffic. For the WAN
you use the SET host function of DECnet, but it is more efficient for local
traffic to use the LAT protocol. The older model DEC terminal servers only
supported LAT or asynchronous DECnet. Newer models also support SLIP and PPP
(check the manuals) since DEC now makes computers that use TCP/IP as well.
TSSnet DECnet is an Amiga implementation of DECnet.
Continue to:
amiga, pc, hardware, sotware, networking
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