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A couple of recent observations.

Posted 11-26-2011 at 08:41 AM by rich_c

I was answering a question the other day about the difference between mid-range (AS/400)and mainframe systems. I touched on how the OS differed but then it occurred to me that Linux will run on everything from big iron to a Raspberry Pi! To the best of my knowledge, there is no other OS that will do that!

My second observation is that there is pretty much no decent, easily found, basic documentation for Windows administrators. Try Googling for basic admin guides for Linux and then...
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public key for repositories

Posted 11-26-2011 at 06:14 AM by neonsignal
Updated 11-26-2011 at 06:16 AM by neonsignal

When adding a new apt repository and calling apt-get update, the following message indicates that the signing key for that repository has not been added to the apt keyring:
The following signatures couldn't be verified because the public key is not available
These keys can be added in manually, although this may vary between repositories. For example, on the, the keys can be obtained by installing the package debian-multimedia-keyring....
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Windows-like folder organization for binaries and libraries through symbolic links?

Posted 11-25-2011 at 03:28 PM by the dsc (linux-related notes)

Just another of those things I catch myself wondering sometimes, but I don't think that are important enough for the forums.

What if linux had folders for each program, more or less like on windows, but still had its "grab-bag" folders for libraries and whatever that may be used for more than one program, but instead of using it through a "$path", it had a symlink within the program's own folder?

Or perhaps it could use by default through something...
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msmtp certificate, tls_trust_file, verified

Posted 11-25-2011 at 08:50 AM by ted_chou12

Hi, I recently installed msmtp, I tried a lot of certificates, the one that I found to work was in /etc/ssl/certs/ca-certificates.crt
If you by any chance don't have it in that directory, it could be partial install or something. (It should come with the package).
Email me if you need it.
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Iptables rule traversal: bandwidth at >= 10K of IP addresses

Posted 11-24-2011 at 08:07 PM by unSpawn
Updated 11-24-2011 at 02:53 PM by unSpawn

Anyone who is interested in iptables performance will find Harris, Melara, Smith and Nico's "Performance analysis of the Linux firewall in a host" (2002) and Kadlecsik and Pásztor's "Netfilter Performance Testing" (2005). But what actually is the effect of a large rule set on performance?

The attached PDF I created is not an an exhaustive study of Netfilter performance but shows you Jperf data and pictures (joy!) for plain rule sets, ipset (iphash) and the iptables...
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File Type: pdf Iptables rule traversal.pdf (551.9 KB, 139 views)
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