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18%
Get the best out of your bandwidth with tc
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
© Russell Shively, 123RF.com
your average packet size is. Tools such as Snort [2] will run for a few minutes and offer detailed data about your networks protocol usage. Ntop [3] is another example that will also give information
18%
Tuning loops – from loop unrolling to Duff's device
28.07.2025
Home »  Archive  »  2025  »  Issue 88: 5 Net...  » 
of all evil" sums up this point of view neatly [3]. The reasons for such a statement are particularly apparent in the many mangling strategies one can choose to apply to loops (Table 1). These strategies
18%
Script utilities in depth: grep, awk, and sed
30.11.2025
Home »  Archive  »  2011  »  Issue 4: Secure...  » 
© jirkaejc, 123RF.com
/share/zoneinfo -type f | \ 07 grep -v 'posix|right|Etc|SystemV | \ 08 grep -i $city` 09 echo -n "Time in $1: "; TZ=`echo $z` date The first section of this code ensures that the script's argument
18%
Avoiding chaos in clusters with fencing
30.11.2025
Home »  Archive  »  2012  »  Issue 09: Windo...  » 
© kobra78, Fotolia.com
on plugins to handle STONITH commands (Figure 3); this is a separate module for the cards just referred to or the generic IPMI plugin. STONITH is then configured via Cluster CIB, (i.e., the Cluster Information
18%
Server virtualization with Citrix XenServer
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Goss Vitalij, Fotolia
.Xensource.xenapi.Connection; 07 import com.Xensource.xenapi.Host; 08 import com.Xensource.xenapi.Session; 09 import com.Xensource.xenapi.Task; 10 11 import de.pm.xenserver.utils.Server; 12 13 public class TestAPI { 14 15
18%
Intrusion detection with Prelude
30.11.2025
Home »  Archive  »  2012  »  Issue 10: Traff...  » 
© Chittima Kasa, 123RF.com
in the Ubuntu 11.x and Debian 6.x package sources. You can also opt for the host-based IDS OSSEC by Trend Micro [3]. If the Prelude Manager is running on a remote server, the rule-based Prelude Correlator
18%
How Upstart boots Ubuntu-based systems
30.11.2025
Home »  Archive  »  2012  »  Issue 07: Xen v...  » 
/init for event conditions that cannot be fulfilled – that is, the jobs would never start or stop of their own accord. These two commands were introduced in their current form in Upstart version 1.3, which in turn
18%
Warding off the rise of VoIP spam
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Izaokas Sapiro, 123RF.com
,GotoIf($["${wl}" = "1"]?found:notfound) 05 exten => _.,n(notfound),agi,captcha.sh 06 exten => _.,n,Playback(to-call-num-press) 07 exten => _.,n,SayDigits(${captcha}) 08 exten => _.,n,Read(usercaptcha||3|1|) 09 exten
18%
A standard cloud computing API
30.11.2025
Home »  Archive  »  2011  »  Issue 6: Perfor...  » 
few years, including Amazon Elastic Compute Cloud (EC2), Amazon Simple Storage Service (S3), and JiffyBox. In the US, these vendors are joined by providers such as GoGrid, Rackspace, and Terremark
18%
Managing Active Directory at the command line
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
Flashon Studio, 123RF.com
The introduction of PowerShell [3] sees Microsoft finally implement long overdue changes to Windows scripting. Unfortunately, PowerShell Version 1 was no big help for Active Directory (AD

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