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32%
Tuning your filesystem's cache
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
. Vmtouch comes to the rescue with its most powerful option: -dl, for "daemonize and lock." Listing 1 Vmtouch Gzip Example 01 $ ./vmtouch /bin/gzip 02 Files: 1 03 Directories: 0 04
32%
Tracing applications with OProfile and SystemTap
30.11.2025
Home »  Archive  »  2010  »  Issue 1: System...  » 
© boing, Photocase.com
686 oprofile-0.9.5-4.fc12.i686 To profile the kernel, you need to tell OProfile where the kernel image is located with the --vmlinux option: opcontrol --setup --vmlinux=/usr/lib/debug/lib/ modules
32%
Check your VoIP networks with SIPVicious and sngrep
30.11.2025
Home »  Archive  »  2025  »  Issue 90 VoIP N...  » 
Photo by Quino Al on Unsplash
are missing, potential causes include invisible SIP traffic, incorrect selection of the network interface, or missing permissions. Your first step is to check whether SIP traffic exists sudo tcpdump -i eth0
32%
Connecting dissimilar IPsec implementations
30.11.2025
Home »  Archive  »  2011  »  Issue 4: Secure...  » 
© Yuri Arcurs, 123RF.com
dh_group modp1024; 09 } 10 generate_policy off; 11 } 12 13 sainfo address 192.168.2.0/24 any address 172.16.0.0/16 any { 14 pfs_group modp1024; 15 encryption_algorithm aes256; 16
32%
ARP cache poisoning and packet sniffing
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© elisanth, 123RF.com
. This type of attack is known as a man-in-the-middle attack. In this article, I mention a number of tools used in ARP cache poisoning attacks, including ettercap, arpspoof, Nemesis, p0f, dsniff, and Scapy
32%
Managing virtual machines
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© Igor Klimov, 123RF.com
run the tool with the -a option, it creates the matching device mapper files: $ kpartx -l ff-clone7.img loop0p1 : 0 20969472 /dev/loop0 2048 $ kpartx -a ff-clone7.img $ kpartx -l ff-clone7.img loop0p1
32%
Cgroups for resource management in Linux
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© Photographer, 123RF.com
.reset_stats= 04 blkio.io_queued=Total 0 05 blkio.io_merged=Total 0 06 blkio.io_wait_time=Total 0 07 blkio.io_service_time=Total 0 08 blkio.io_serviced=Total 0 09 blkio.io_service_bytes=Total 0 10
32%
Shell scripts: Equal rights for Unix derivatives and Linux
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Mike Flippo, 123RF
server PING server: 56 data bytes 64 bytes from server.examplenet.com (192.168.5.6): icmp_seq=0. time=0.415 ms 64 bytes from server.examplenet.com (192.168.5.6): icmp_seq=1. time=0.215 ms 64 bytes from
32%
Comparing 5 to 50TB NAS storage boxes
31.10.2025
Home »  Archive  »  2012  »  Issue 12: NAS S...  » 
© Franck Boston, fotolia.com
disks. They dubbed their system RAID (Redundant Array of Inexpensive Disks). The original publication http://1 described RAID levels 1 through 5. Today, we also have RAID levels 0 and 6 and still higher
32%
Getting started with I/O profiling
30.11.2025
Home »  Archive  »  2012  »  Issue 08: FreeNAS  » 
© Photosani, Fotolia.com
a line like this: 1269925389.847294 write( 17, " 37989 2136595 2136589 213" ..., 3850) = 3850 <0.000004> This single line has several interesting parts. First, the amount of data written appears after

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