An Introduction to FreeS/WAN, Part I
And now the moment of truth! First on George and then on Gracie, we enter the command:
ipsec setup restart
George will read /etc/ipsec.conf, load the george-gracie tunnel definition into its connection setup database and wait for connections. Gracie will do the same thing and then bring up the tunnel. Startup messages will be logged to /var/log/messages or /var/log/secure. If on the client system the output from ipsec setup restart ends with an “IPsec SA established” message, your tunnel is up! Try pinging or otherwise connecting to hosts on the remote network; the connection should behave no differently from before when you brought the tunnel up. In fact, you may want to run tcpdump on your tunnel-bound Ethernet interface to make sure that only ESP (Encapsulating Security Payload) packets (i.e., encrypted tunnel packets and not actual Ping, FTP packets, etc.) are being sent out.
Next month we'll look at another VPN scenario or two and delve deeper into the splendors of FreeS/WAN. Hopefully this was enough to get you started down the path to secure wireless networking!
Mick Bauer (firstname.lastname@example.org) is a network security consultant for Upstream Solutions, Inc., based in Minneapolis, Minnesota. He is the author of the upcoming O'Reilly book Building Secure Servers with Linux, composer of the “Network Engineering Polka” and a proud parent (of children).
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.
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