home *** CD-ROM | disk | FTP | other *** search
- Echosamp consists of two subdirectories, an echo client (echoclnt)
- and an echo server (echosrv), located in \TOOLKIT\SAMPLES\TCPIPTK\ECHOSAMP.
-
- The echoclnt directory contains two samples of echo clients:
-
- ECHOCLNT.C - is an echo client that uses one subroutine to handle
- both UDP requests and TCP requests.
-
- ECHOCLST.C - is an echo client that uses separate subroutines to handle
- UDP requests and TCP requests.
-
-
- This program implements the client side of the Echo protocol (RFC 862). The
- Echo protocol is very simple: whatever the client sends to the server, the
- server will send right back to the client. The complete RFC is reproduced
- below:
-
-
- Network Working Group J. Postel
- Request for Comments: 862 ISI
- May 1983
-
- Echo Protocol
-
- This RFC specifies a standard for the ARPA Internet community. Hosts on
- the ARPA Internet that choose to implement an Echo Protocol are expected
- to adopt and implement this standard.
-
- A very useful debugging and measurement tool is an echo service. An
- echo service simply sends back to the originating source any data it
- receives.
-
- TCP Based Echo Service
-
- One echo service is defined as a connection based application on TCP.
- A server listens for TCP connections on TCP port 7. Once a
- connection is established any data received is sent back. This
- continues until the calling user terminates the connection.
-
- UDP Based Echo Service
-
- Another echo service is defined as a datagram based application on
- UDP. A server listens for UDP datagrams on UDP port 7. When a
- datagram is received, the data from it is sent back in an answering
- datagram.
-
-
- Following are details on building and executing the echo server samples.
-
- 1. To compile and link the sample programs, type:
-
- nmake -f vacpp.mak (to build using the VisualAge C/C++ compiler)
-
- 2. Executing echoclnt.exe and echoc1st.exe:
-
- ***note before executing the an echo client, the server must be active
- on the destination host.
-
- a. To execute the echoclnt.exe client, type:
-
- echoclnt TCP hostname (using the TCP protocol)
- echoclnt UDP hostname (using the UDP protocol)
-
- Then any data typed in the client OS/2 session will be echoed from the server.
-
- b. To execute the echoc1st.exe client, type:
-
- echoc1st TCP hostname (using the TCP protocol)
- echoc1st UDP hostname (using the UDP protocol)
-
- Then, any data typed in the client OS/2 session will be echoed from the server.