X-ISP and Maintaining Multiple Account Records
Connecting your Linux box to a PPP server can be a frustrating task, especially if you are not familiar with the scripting requirements, authentication modes or network settings your ISP expects you to use. X-ISP, a program written by Dimitrios P. Bouras (email@example.com), takes what could be a complex task and simplifies it with a clean, effective GUI front end.
What makes X-ISP such a great piece of software? First, it is a user-friendly X-based front end to PPP/CHAT. Second, X-ISP provides a dialer, xispdial, and a stripped-down terminal, xispterm, which help work out some of the difficulty in establishing a connection. By using PPP/CHAT, X-ISP leaves most of the work to the operating system, while also giving experienced users the freedom to hack familiar connection scripts for any special needs.
X-ISP can be found at http://users.hol.gr/~dbouras/. To run X-ISP, you need to have X11R6, Xforms-0.88 and ppp-2.2.0f, and your modem must be set to verbose mode so that X-ISP can pick up connection status correctly. The home page provides comprehensive information and screen shots of the configuration and main screens. Once downloaded, the installation README gives clear instructions on how to compile X-ISP on a variety of systems.
X-ISP adds two helper modules called by pppd (see Figure 1). The first, xispdial, takes care of the dialing. xispdial sits between pppd and chat and is used by X-ISP to start the connection. xispdial reads an environment file residing in the user's directory. After getting the information for the ISP selected, it calls chat to make the connection. Once connected, control of the modem is turned over to the second module, xispterm. This terminal program allows the user to log in to the system manually, or in the case that ip-up/ip-down scripts exist, xispterm runs those scripts. X-ISP also runs user-specific scripts, .xisp-up/.xisp-down, which reside in the user's directory and provide increased versatility.
A named pipe sends information from pppd, chat, xispdial and xispterm to the terminal window in X-ISP. The pipe gives immediate feedback as to system and connection status. The terminal window provides a clean view into the connection sequence and invaluable information for tracking down any connection errors.
The user interface provides all actions through five buttons, three pull-down menus and a drop list for selecting which account to activate. The first step is setting up an account through the Options menu.
First, open the “Account Information” item. Enter the name of the account to add, then enter the phone number, user name and password. You will also need to know which authentication protocol your ISP uses. (See Figure 2.)
The next item, “Dialing and Login”, has you set the login and connect environment. Set the number of retries, connect notification, ISP callback and login setting. For manual login, X-ISP will start xispterm, or if you know the sequence, you can put together an automated login script and send user name, password and any initialization commands to the remote host. (See Figure 3.) X-ISP will use the connection script for automatic login or ISP call-back. For PAP or PAP/CHAP-Secrets authentication, the script will be ignored.
“Communication Options” allows you to control settings for the modem, baud rate, flow control, initialization and reset strings.
The final item, “TCP/IP Options”, sets up Network Addressing. The most notable point here is the “Support for ip-up/ip-down” scripts. If set to “yes”, the DNS addressing can be set for each account, providing great flexibility when maintaining multiple accounts by dynamically updating the /etc/resolv.conf file. (See Figure 4.) When using ip-up/ip-down, X-ISP sends the ipparam option to pppd, which passes a string to ip-up/ip-down containing the pipe name for X-ISP, the description set in Account Information, and if set, the DNS addresses specified. X-ISP will also display any information from ip-up/ip-down on the terminal window via the named pipe.
The next menu choice is Logging. If you are located in Europe, you will get the most advantage of this feature as the telephone companies (TelCo) listed are applicable only there. By selecting the appropriate TelCo and zone, X-ISP will keep track of on-line cost.
The Statistics item displays usage data in a window with a text summary and a bar graph.
The last item is the Help menu. Any issues you come across will probably be addressed in this very thorough help file. The “about” screen displays the version number and how to get in touch with the author.
Once your account is set up, you are ready to connect. First, check the following to be sure the rest of the system is in order:
Set pppd for all users (i.e., other than just root):
chmod u+s /usr/sbin/pppd
Check the permissions on all X-ISP modules (xispdial, xispterm ...) so that group root can execute them (this should be done by the install script):
Add any users who will use X-ISP to the dialout or root group for Debian or Red Hat releases, respectively.
Now, to connect, click on the “Connect” button in the main window of X-ISP. You should see the connection feedback in the small terminal window to the right. (See Figure 5.) Once the connection is established, the status windows will report the assigned IP address, modem connect status, connection speed and time since connected. The status is updated every 15 seconds, so if your connection is dropped, a maximum latency of 15 seconds will pass before X-ISP recognizes the dead connection and allows you to reconnect.
Hopefully, everything now works correctly. If there is a problem, the terminal window in X-ISP should give you an indication of where to look.
Fast/Flexible Linux OS Recovery
On Demand Now
In this live one-hour webinar, learn how to enhance your existing backup strategies for complete disaster recovery preparedness using Storix System Backup Administrator (SBAdmin), a highly flexible full-system recovery solution for UNIX and Linux systems.
Join Linux Journal's Shawn Powers and David Huffman, President/CEO, Storix, Inc.
Free to Linux Journal readers.Register Now!
- Download "Linux Management with Red Hat Satellite: Measuring Business Impact and ROI"
- Sony Settles in Linux Battle
- Libarchive Security Flaw Discovered
- Peppermint 7 Released
- Profiles and RC Files
- Maru OS Brings Debian to Your Phone
- The Giant Zero, Part 0.x
- Snappy Moves to New Platforms
- Git 2.9 Released
- Astronomy for KDE
With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide