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Netcat – The admin's best friend
31.10.2025
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© Dmitry Rukhlenko, 123RF.com
seconds, for example: # nc -p 16000 -w 30 examplehost.tld 22 If firewalling is in place and you need to originate your connection from a specific IP address to open a port, then you can enter: # nc -s 1.2.3 ... 12
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Security without firewalls
31.10.2025
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© rukanoga, 123RF.com
starting 12.34, so, for example, 12.34.56.78 will be allowed to connect to ALL services and not just SSH. As well as these flexible options, you can also declare old school subnets directly: sshd: 1.2.3 ... 12
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openlava – Hot resource manager
31.10.2025
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© Konrad Bak, 123RF.com
.cluster.openlava #----------------------------------------------------------------------- # T H I S I S A O N E P E R C L U S T E R F I L E # # This is a sample cluster definition file. There is a cluster # definition file for each cluster. This file's name should be # lsf ... 12
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Dynamic routing in Linux with Quagga
31.10.2025
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© petrol, 123RF.com
password 8 ZDF339a.20a3E 05 log file /var/log/quagga/zebra.log 06 service password-encryption 07 ! 08 interface eth0 09 multicast 10 ipv6 nd suppress-ra 11 ! 12 interface eth1 13 ip address 10 ... 12
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Give your servers the once over with Nmap
31.10.2025
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© ragsac, 123RF.com
.nmap.org (64.13.134.52): Not shown: 994 filtered ports PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 4.3 (protocol 2.0) 25/tcp closed smtp
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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