The Dolos is a concrete block with a specific geometric shape that is used to protect harbour walls from the sea damage. Dolosse which weigh up to 20 tons work by dissipating, rather than resisting, the energy of waves. It was designed by Eric Merrifield and initially used at East London harbour in South Africa before coming into widespread use across the world. Merrifield never patented the design, saying that he wanted the Dolos to be his contribution to civil engineering.
Firewalls are becoming increasingly important in today’s world. Hackers and automated scripts are constantly trying to invade your system and use it for Bitcoin mining, botnets or other things. To prevent these attacks, you can use a firewall on your system. IPTables is the strongest firewall in Linux because it can filter packets in the kernel before they reach the application. Using IPTables is not very easy for Linux beginners. We have created easywall - the simple IPTables web interface . The focus of the software is on easy installation and use. Access this neat software over on github: easywall
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