Best of Technical Support
I cannot get a second PPP connection to work correctly. I used the X Window tool netcfg to set up ppp0 to connect with the University of South Florida. This setting seems to work properly, connecting and disconnecting fine. Then, I set up ppp1 to connect to Compuserve. This appears to connect okay, but I cannot shut down the modem without shutting down my Linux PC. When I look at the system messages file, I see that the scripts start out using ppp1 settings for the connection but once PPP is started it says it is connected to ppp0. I also see that ppp0 registers with the kernel and not ppp1 as it should. I have tried to figure out the various scripts involved but can't make heads or tails of them. I am new to Linux and don't understand the BASH scripting language well. Help.
—Mike Richards Red Hat 4.2
Red Hat's PPP number assignment scheme is broken. Their scripts don't guarantee that ppp1, labeled in the setup utilities, will be activated in the kernel as ppp1. This happens because PPP connections are assigned dynamically. Although you may have defined ppp1 in the Red Hat configuration utility, that setup will be registered as ppp0 inside the kernel if it is the only PPP connection active.
I need a little more detail about your setup to suggest the best fix to your problem, but here's how the scripts work under Red Hat. This may give you enough information to work out a solution.
The file /etc/rc.d/init.d/network is run at boot time with the argument “start”. It looks for configuration files of the form ifcfg* in the /etc/sysconfig/network-scripts/ directory. As a result, if you edit (as is common when not running X) one of those files with an editor that creates a backup file (e.g., ifcfg-eth0~), the Red Hat scripts will run the backup file as well as the new file. For each connection type (Ethernet, PPP, PLIP, etc.), there are “up” and “down” files that start and stop the connection. The network script runs the “up” script with the appropriate ifcfg file as an argument, e.g., /etc/sysconfig/network-scripts/ifup-ppp /etc/sysconfig/network-scripts/ifcfg-ppp0.
There is a corresponding “down” script to shutdown the connection called /etc/sysconfig/network-scripts/ifdown-ppp /etc/sysconfig/network-scripts/ifcfg-ppp0.
You can run these scripts from the command line for testing purposes.
—Larry M. Augustin, VA Researchl firstname.lastname@example.org
My new system came with a new Microsoft Mouse. This mouse doesn't work with Linux. After a couple of days of messing around, I've come to the conclusion that there is a problem with my model of the Microsoft Mouse—on the underside of the mouse is the designation Serial Mouse 2.1A. I have concluded that the problem lies with this mouse because the new system works perfectly well with my old Microsoft Mouse. Is something wrong with the new mouse?
—Ed Green Slackware 2.0.29 Walnut Creek
I don't have access to the newest mouse, so Francois Chastrette has helped a lot with this problem. We are working on a satisfactory solution to include in gpm 1.12 right now (end of August). By the time you read this Linux Journal, the new version of the mouse server should be available by FTP.
X support might take a bit longer as the X team has a huge package to manage. In the meantime, you can use the -R option of gpm to feed clean mouse packets to the X server.
—Alessandro Rubini email@example.com
Practical Task Scheduling Deployment
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
Join Linux Journal's Mike Diehl and Pat Cameron of Help Systems.
Free to Linux Journal readers.View Now!
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- Stunnel Security for Oracle
- The Firebird Project's Firebird Relational Database
- Murat Yener and Onur Dundar's Expert Android Studio (Wrox)
- SUSE LLC's SUSE Manager
- Managing Linux Using Puppet
- My +1 Sword of Productivity
- Non-Linux FOSS: Caffeine!
- Google's SwiftShader Released
- Doing for User Space What We Did for Kernel Space
- SuperTuxKart 0.9.2 Released
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