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18%
Strategies for routing voice calls around a firewall
30.11.2025
Home »  Archive  »  2010  »  Issue 0: Active...  » 
gnohz, 123RF.com
headers; the second – separated by an empty line – contains the Session Description Protocol (SDP) [3] as the SIP payload. The SDP part describes the audio stream; that is, it contains data
18%
Overview of cloud platforms and appliances
30.11.2025
Home »  Archive  »  2010  »  Issue 2: Backup...  » 
Athiphan Chunmano, 123RF
, your scaling options are virtually unlimited, and you can add Content Delivery Networks (CDN). As an example, SlideShare [1] integrates document downloads and Flash file hosting with Amazon S3 and Cloud
18%
Business continuity for small to medium-sized enterprises
30.11.2025
Home »  Archive  »  2012  »  Issue 08: FreeNAS  » 
© Andrea, Fotolia.com
) or even be booted in a virtual environment. This virtual boot function is perfect for smaller companies. It lets administrators boot a ShadowProtect image directly in the free VirtualBox [3] environment
18%
New Monitoring Tools
14.04.2021
Home »  HPC  »  Articles  » 
to “expand” (Figure 2). If you want to reduce the zoom, use the m key to “minimize” (Figure 3). Think of it as zooming in and out in your web browser. If you like, you can zoom in on all the charts
18%
Monitoring events with the Audit daemon
17.02.2015
Home »  Archive  »  2015  »  Issue 25: Safe...  » 
Lead Image © alphaspirit , 123RF.com
. Listing 1 auditd.conf log_file = /var/log/audit/audit.log log_format = RAW log_group = root priority_boost = 3 flush = INCREMENTAL freq = 20 num_logs = 5 disp_qos = lossy dispatcher = /sbin
18%
Finding Your Way Around a GPU-Accelerated Cloud Environment
30.05.2021
Home »  Archive  »  2021  »  Issue 63: Autom...  » 
Lead Image © Lucy Baldwin, 123RF.com
acceleration capabilities, if any, are available. This is quickly discovered with the command: $ ec2metadata | grep instance-type instance-type: p3.2xlarge Variations of the ec2metadata tool query the AWS
18%
Accelerate web applications with Varnish Cache
07.06.2019
Home »  Archive  »  2019  »  Issue 51: Self-...  » 
Lead Image © Aleksandr Frolov, 123RF.com
delivered HTML page or image is valid for a certain period of time. The web server passes on this information unchanged, or you can use an ETag [3] for this purpose. Conversely, the browser then asks the web
18%
Live snapshots with Virtual Machine Manager
20.05.2014
Home »  Archive  »  2014  »  Issue 20: IPv6...  » 
Lead Image © Iryna Denysova, 123RF.com
in the graphical front end, Virtual Machine Manager (VMM) [1]. In general, Qemu [2] or libvirt [3] distinguish between internal and external snapshots. For internal snapshots, libvirt freezes the complete state
18%
Secure your data channel with stunnel
25.03.2020
Home »  Archive  »  2020  »  Issue 56: Secur...  » 
Lead Image © Petr Vaclavek, 123RF.com
to Google's SMTP server via port 25. Communication on this port is usually in plain text. Two stunnel instances are now required. The first instance again runs as a client on the laptop (Listing 3
18%
Measuring the performance of code
04.08.2020
Home »  Archive  »  2020  »  Issue 58: Graph...  » 
Lead Image © Lucy Baldwin, 123RF.com
in the standard Python built-ins [2] and in the NumPy library [3]. Figure 1: IPython session comparing two implementations of a round routine. Unless you

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