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92%
Beyond monitoring: Mathematical load simulation in Perl
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© kudryashka, 123RF.com
100 0.067 95 23 5 10 99 0.099 96 22 6 20 94 0.210 97 22 6 Unfortunately
92%
Get the best out of your bandwidth with tc
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
© Russell Shively, 123RF.com
is as follows: tc filter add dev $DEV protocol ip parent 1:0 prio 100 u32 match ip $DIR 12.34.56.78 flowid 1:12 You'll be glad to know the filter's config is much simpler than the classes or the qdisc
92%
Cgroups for resource management in Linux
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
© Photographer, 123RF.com
in the cgroup. You can then use the tc with the group. Start by defining the classID for the cgroup: echo 0x00100001 > /cgroup/net_cls/libvirt/qemu/guest/net_cls.classid This hexadecimal number comprises two
91%
Creating an SFTP jail
30.11.2025
Home »  Archive  »  2011  »  Issue 3: Are yo...  » 
Juan Manuel Ordonez, 123RF.com
.bash_profile. Note that this setup assumes you will later install OpenSSH in /usr/local/. Listing 1 .bash_profile Variables 01 CC=gcc 02 CPPFLAGS=-I/usr/local/ssl/include 03 EDITOR=vi 04
91%
One metric to rule them all
31.10.2025
Home »  Archive  »  2012  »  Issue 11: Cloud...  » 
at the output of uptime [1] on OS X: 13:03 up 2 days, 12:01, 2 users, load averages: 0.52 0.59 0.63 The uptime command displays the load average in its common form, averaging the last one, five, and 15 minutes
90%
Intruder detection with tcpdump
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
© Monika Wisniewska, 123RF.com
.g., 192.168.0.0/24). # tcpdump net 192.168.1.1/24 Src, dst Only capture packets from a source or destination. # tcpdump src 192.168.100.234# tcpdump dst 10.10.24.56 host
90%
Monitoring network computers with the Icinga Nagios fork
30.11.2025
Home »  Archive  »  2010  »  Issue 1: System...  » 
© Alterfalter, 123RF.com
notifications_enabled 0 30 } Listing 3 commands.cfg (Excerpt) 01 # 'notify-service-by-email' command definition 02 define command{ 03 command_name notify
89%
The next generation of Internet connectivity
30.11.2025
Home »  Archive  »  2011  »  Issue 3: Are yo...  » 
ktsdesign, 123RF.com
radvd Configuration 01 interface eth1 02 { 03 AdvSendAdvert on; 04 MinRtrAdvInterval 30; 05 MaxRtrAdvInterval 100; 06 prefix 2001:42b5:d64a:0::/64 07 { 08 AdvOnLink on; 09
89%
OpenVPN with e-tokens in large-scale environments
30.11.2025
Home »  Archive  »  2011  »  Issue 5: Pen Te...  » 
© sTan, fotolia.com
version [9]. Listing 3 /etc/openvpn/ccd/John_Doe 01 # John Doe 02 ifconfig-push 192.168.1.3 255.255.255.0 03 push "topology subnet" 04 push "redirect-gateway" 05 push "dhcp-option DNS 192
88%
Managing virtual machines
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© Igor Klimov, 123RF.com
on the guest system look similar to Listing 2. Listing 2 rc.local 01 #!/bin/sh 02 dnsserver=192.168.111.20 03 hostname=`hostname` 04 ip=`LANG=C /sbin/ifconfig eth0 | grep "inet addr" | awk -F

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