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Iptables rule traversal: bandwidth at >= 10K of IP addresses

Posted 11-24-2011 at 09:07 PM by unSpawn
Updated 11-24-2011 at 03:53 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, 104 views)
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Old

Migration from Solaris 10 to Red Hat Enterprise Linux

Posted 11-23-2011 at 11:15 PM by bits45

We've been using Solaris 10 on Sparc and x86 for years. With the recent Oracle takeover and the lack of OSS movement (updates) from Sun (too little, too late), we've been moving all of our Apache and MySQL servers to RHEL 5.7. In most cases we've stayed on the same exact Egenera Nehalem pBlades and used the same SAN storage. So all the hardware is exactly the same. The speed increase comparison between Solaris 10 and RHEL has been nothing short of amazing. Seems like everything goes faster...
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Old

openSUSE 12.1 GNOME Clean-Up

Posted 11-22-2011 at 07:22 PM by wagscat123
Updated 11-22-2011 at 07:27 PM by wagscat123

Even though there technically is no connection between the releases in the 11.x series, I'm still very happy to see 12.x out now. (11.0-11.4 all had been under Novell, used KDE4 by default and used GNOME 2)

Something I've learned about openSUSE 12.1:

1. To imitate GNOME 3 as much as possible
Unlike previous changes to the GNOME default look, it is impossible to bring GNOME 100% back to the way to was before. However, you can make it look much more similar.
...
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Old

Slowly getting it...

Posted 11-22-2011 at 05:12 AM by m3rl1n

Since my last blog entry - in which I mentioned that I would start learning about Distributed Technologies, I have been going through many AHA! moments that Sigmund Freud so nicely described. In my quest for getting savvy on Distributed Object Programming I found that CORBA is the only way to go. It is well known as a complex mess of incomprehensible matter in many communities. I shared that vision since last week, now I think it is quite doable.

The secret to learning CORBA is to...
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Old

preserving the master boot record

Posted 11-21-2011 at 08:54 PM by neonsignal

The master boot record (MBR) from an unmounted drive can be preserved using dd. For example, boot from a live CD and copy the master boot record of the hard drive sda to a usb key mounted at /mnt/sdb1:
Code:
dd if=/dev/sda of=/mnt/sdb1/mbr.img bs=512 count=1
The MBR can be restored in a similar way. Be very cautious at this step, because the MBR typically holds the partition table and the initial boot loader stage, so a mistake can be difficult to recover from....
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