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Give your servers the once over with Nmap
31.10.2025
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© ragsac, 123RF.com
a sample of the output it produces (Listing 1). Listing 1 Sample Nmap Output # nmap -A -T4 scanme.nmap.org Starting Nmap ( http://nmap.org ) Interesting ports on scanme
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Netcat – The admin's best friend
31.10.2025
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© Dmitry Rukhlenko, 123RF.com
the source port of your connection to 16000, you could add the -p option: # nc -p 16000 examplehost.tld 22 To add a timeout for latency testing, you could use the -w parameter with the number of seconds – 30
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Building a custom Cyberdeck
07.10.2025
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Lead Image © Lucy Baldwin, 123RF.com
RAM to 8GB and CPU speed to 2.4GHz – from 4GB and 1.8GHz, respectively, in the Pi 400. The core design was also upgraded from the ARM Cortex-A72 to Cortex-A76
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Security without firewalls
31.10.2025
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© rukanoga, 123RF.com
's usually TCP port 22) to port 2222, for example, to keep port scans from filling up your logs. Without TCP Wrappers enabled, scans might run dictionary attacks on your server where password combinations
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Managing virtual infrastructures with oVirt 3.1
31.10.2025
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© Kheng Ho Toh, 123RF.com
.1_release_notes oVirt Installation Guide: http://www.ovirt.org/w/images/a/a9/OVirt-3.0-Installation_Guide-en-US.pdf
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Moving HPC to the cloud
31.10.2025
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© Zarko Cvijovic, 123RF.com
of options, including dual four-core Xeon, dual six-core Xeon, or quad 12-core AMD processors ranging in speed from 2.2 to 2.9GHz with 24 to 128GB of RAM per server and up to 1TB of scratch local storage per