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network simulator

Using PHP scripts

Open the TP05_03.xml file and move to the Application mode.
A navigator is installed on st1, a HTTP server on st4, and a DBMS on st5: Make sure they are.
Select the "step by step" simulation mode.
Launch the web browser, using st1’s pop-up menu, and ask for the "f004.php" URL.
The HTTP server reads the PHP code so as to build up the HTML flow that will be sent:

PHP code

Of course, the navigator receives only the HTML code.
Make sure it does by clicking on the button "show HTML source".
Close the navigator.

Watch the RDBMS’s configuration installed on st5 (pop-up menu, installed software, manage).
The root user has a password.
Start again the navigator on st1, and choose "f006.php".
The HTTP server fails to connect to the DBMS; the information related to the connection is not valid.
The server produces an error message and sends it to the navigator in the form of HTML code.

Edit the "f006.php" file on st4’s hard disk.
Input the correct information required for the connection to the DBMS:

PHP script

Start again the navigator on st1, and choose "f006.php". Everything works correctly.
We have simulated a 3-tiers pattern, i.e. we have connected three software components.
Note: The HTTP server asks the DBMS to send back a cursor, and not a scalar value.

Close the navigator.
Edit the "f008.php" file on st4’s hard disk. Input the correct information required for the connection to the DBMS.
Start again the navigator on st1, and choose "f007.html".
This page sends back a form linked to a JavaScript function, and which performs a validity check.
Input the information below:

HTML form

The information is not correct because the identifier of a product is coded on only one character.
Click on the "submit" button.
The function is executed, the input is rejected, and the form is not submitted.

Correct the wrong data, and ask for the identifiers between "A" and "B".
Click on the "submit" button.
The request is sent to the HTTP server.
You can see the parameters sent to the "f008.php" page in the textbox located in the upper part of the screen.
The server executes the PHP code: this time, there are more exchanges.
The navigator receives and displays the two rows.
Close the navigator.

Open the TP05_04.xml file.
The network that is used now is more complex.

HTML pages on Internet

The local area network on the right represents a company which publishes a dynamic Web site.
The local area network on the left represents a company which wants to access this web site.
Launch the navigator on st1, and ask for the "f006.php" page on the "172.12.0.4" server, everything works correctly.
Watch the configuration of the various elements:

IP configuration of network interfaces, stations and routers.
Routers' routing table.
Routers' natPat table.
Programs' configuration.

If you need to, go over the lesson on the transport mode.

- SOPIREMINFO . NETWORK SIMULATOR -