diff --git a/Manuals/Tcpi-ug/Configurations/Dialup/intro.docbook b/Manuals/Tcpi-ug/Configurations/Dialup/intro.docbook
index 6c3a7b8..1a327c5 100644
--- a/Manuals/Tcpi-ug/Configurations/Dialup/intro.docbook
+++ b/Manuals/Tcpi-ug/Configurations/Dialup/intro.docbook
@@ -1,4 +1,4 @@
-<sect1 id="configurations-ppp-intro">
+<sect1 id="configurations-dialup-intro">
<title>Introduction</title>
@@ -6,206 +6,19 @@
This chapter describes two computers configuration, one acting
as server and other as client. The server computer will be
configured to provide internet services and the client to make
- use of internet services provided by the server computer. The
- connection medium both client and server computer use is the
- telelphone line (i.e., the same medium you use to realize
- phone calls). In this configuration, both client and server
- computers use special devices named <quote>Modems</quote> to
- transmit data in form of sound across the telephone line. The
- configuration described in this chapter could be a good choise
- when the only communication medium you have access to is the
- telephone system.
- </para>
-
- <para>
- Even this configuration tries to reduce the lack of
- communication, there are limitations around it that we cannot
- take off, yet. The following list shows what these limitations
- are:
- </para>
-
- <itemizedlist>
- <listitem>
- <para>
- Only one connection (of 15 minutes) is possible at a time.
- </para>
- </listitem>
- <listitem>
- <para>
- More than 3 consecutive connections from the same phone number
- in a time range of 60 minutes means that that number is
- attacking the ISP to provoke a <quote>Denying of
- Service</quote> (DoS) attacks. In such cases, the phone number
- originating the phone call will be denyed from realizing
- further phone calls onto the ISP in the next 15 minutes. If
- after 15 mintes, 3 new consecutive connections are detected
- from the same phone number than before, the delay time will be
- duplicated on each consecutive interval (e.g., 15*1 for the
- first time, 15*2 for the second time, 15*3 for the third time,
- and so on).
- </para>
-
- <note>
- <para>
- In order to achieve an acceptable degree of efficiency when
- controlling consecutive connections from the same phone
- number, it is required that both the client's phone number and
- connection time be registered somehow in the server (e.g., Is
- it on pppd's log file?). Without such information it would be
- very difficult to achieve any prevention against DoS attacks
- originated from incoming calls.
- </para>
- </note>
-
- </listitem>
- <listitem>
- <para>
- The ISP is isolated from Internet, so it is not possible to
- provide Internet access through the ISP. For example, don't
- ever think you will be able to send international e-mail to
- Gmail or Yahoo, nor visit web sites like Google or Wikipedia.
- I really would like to provide such accesses, but without a
- link to Internet I don't have where to send your requests.
- </para>
- </listitem>
- <listitem>
- <para>
- The information generated inside the ISP is jailed to it. This
- way, it will be available to people registered inside the ISP
- only (e.g., through the web interface).
- </para>
- </listitem>
- <listitem>
- <para>
- The implementation of services that required persistent
- connections (e.g., <application>chats</application>) will not
- be considered as a practical offer. Instead, only
- asynchronous services (e.g.,
- <application>e-mail</application>) will be supported. This
- restriction is required to reduce the connection effective
- times. For example, consider an environment where you connect
- the ISP to send/receive e-mails only and then quickly
- disconnect from ISP to release the line for others to use.
- There is no need for you to be connected at the same time
- someone else sends you an e-mail, this in order for you to
- receive it. E-mail messages sent to you will be available in
- your mailbox the next time you establish a point-to-point
- connection with the ISP and use your mail client to send and
- receive new messages. Likewise, you don't need to be connected
- to the ISP in order to write your e-mail messages. You can
- write your messages off-line and then establish connection to
- send it whe it be ready.
- </para>
- </listitem>
- <listitem>
- <para>
- Your user profile will be automatically removed from the ISP
- when no effective point-to-point connection be established by
- you in a period greater than 7 days since the last effective
- point-to-point connection you established to the ISP. When
- your user profile is removed, you will need to get registered
- again (i.e., create a new user profile) using the web
- interface provided by the ISP. </para>
- </listitem>
- <listitem>
- <para>
- When a user receive messages, the user's e-mail client must be
- configure to move the e-mail messages from server to client.
- This is forced in the ISP computer by denying user's from
- accessing the IMAP service. Only POP service will be
- available. This restriction is required to save disk space on
- ISP computer.
- </para>
- </listitem>
- </itemizedlist>
-
- <para>
- I'm very sorry about these limitations, but this is the best I
- can offer with one PC, one modem, and one single telephone
- line. If you think this configuration can be improved somehow,
- please send me an e-mail to
- <email>al@projects.centos.org</email>. Notice that, in order
- for you to be able to send e-mails to this address you need to
- do it using the Mail Transfer Agent provided in the server
- computer. I don't answer phone calls personally, the phone is
- very busy answering point-to-point connections ;).
- </para>
-
- <warning>
- <para>
- The <systemitem
- class="domainname">projects.centos.org</systemitem> mentioned in
- this chapter must not be confused with the real infrastructure
- provided by &TCP; on Internet. The domain name mentioned in
- this chapter is not available on Internet and was created to
- illustrate the real infrastructure inside an isolated
- environment.
- </para>
- </warning>
-
- <para>
- In order for you to share information with others, it is
- required that both you and the person you want to share
- information with, have an e-mail address registered inside
- ISP. This registration process is realized through a secured
- web interface accessable through an encrypted connection. The
- web interface provided should permit everyone to update or
- delete their personal profiles. All actions realized through
- this web interface must be simple enough to be achieved in
- less than 15 minutes (the time you have before the
- point-to-point connection be closed by the ISP).
- </para>
-
- <para>
- Inside the ISP, user information is stored inside an LDAP
- server. The web application manipulates LDAP records and all
- related files inside the operating system that make possible a
- user to establish a point-to-point connection to the ISP, as
- well as registering, updating or deleting its profile inside
- the ISP. Care should be taken to prevent one user to
- modify/delete profiles from other users. The user's profile
- administration is individual to each user using the user's
- identity as reference. The user's identity is determined by a
- username (e.g., the e-mail address) and a password. The LDAP
- server will be available for everyone to consult from their
- mail clients. Inside the web application, verifications must
- be included to avoid duplicated values, invalid characters and
- similar stuff.
+ use of those internet services provided by the server
+ computer. The connection medium both client and server
+ computer use is the telelphone line (i.e., the same medium you
+ use to realize phone calls). In this configuration, both
+ client and server computers use special devices named
+ <quote>Modems</quote> to transmit data in form of sound across
+ the telephone line.
</para>
<para>
- Inside the ISP, all related subsystems (e.g., Postix,
- Cyrus-Imapd and Saslauthd) must retrive user information from
- LDAP server. Likewise, the mailbox administration must be
- automated based on the users in the LDAP server. The web
- application must be able to be aware of all files related
- inside the infrastructure in a way that administration tasks
- can be automated and presented friendly to end users (this
- will required the web application to run some program that
- needs root privileges =:-|). The whole process would be as
- follows:
- </para>
- <orderedlist>
- <listitem>
- <para>
- Establish a point-to-point connection to ISP, as described in
- <xref linkend="configurations-ppp-modem-client" />.
- </para>
- </listitem>
- <listitem>
- <para>
- Register a new user profile through the web application
- provided by the ISP.
- </para>
- </listitem>
- <listitem>
- <para>
- Configure your workstation using the information provided as
- result of a successful registration in order to start using
- the services provided by the ISP you recently get registered
- in.
+ The configuration described in this chapter is a good choise
+ when the only communication medium you have access to is a
+ telephone network.
</para>
- </listitem>
- </orderedlist>
-
+
</sect1>