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Modern cryptography is key to modern on line communications. This area of IT looks very complex and daunting to many, so it’s always a good start to get the basics right. I not gonna use much words for explaining, others have done that much better. Communicate secretly requires encryption so others cannot read it. Encryption uses some secret or key. Both sides need to have this key. So far, nothing new here. Has been done like that for thousands of years. But wait, what is missing here… Right, knowing who is who or trust. Without trust, I might send a secret message to the wrongRead More →

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The IPv6 prefix I got from my ISP in Denmark did not stick, as explained here. Well, Google revealed that my ISP expects IAID to be 1 (one), when requesting a prefix using DHCPv6. The mechanism around IAID is explained in RFC3633. And guess what, the DHCPv6 client in my Mikrotik router requests a prefix with IAID 2 (two), not 1. This IAID is a number associated with the interface, and in my case WAN interface “ether1” has IAID: 2. You can find your IAID as follows: “:put [/interface find where name=“ether1”]”. I have not found a way to change this mapping in RouterOS. RouterOSRead More →

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In Denmark, FTTH is common. The fiber-providers each have an area that they connect. There is no overlap, unlike in the Netherlands where some households have multiple fibers sticking out of the pavement. These fiber-providers provide services for a few different ISP’s, some regional and some nationwide. These are the broadband options at my location from the “CheckYourNetwork” website, prepared by the Agency for Digitisation (Digitaliseringsstyrelsen). My location is connected by EWII, a local energy company that also provides internet service. You have a “Fiberboks” somewhere in your house that terminates the fiber and provides an ethernet connection. I went with EWII for their internetRead More →

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So I chose this rather provocative title. Because the subject is discussed on the internet in a very non technical way: “With 16GB you are future proof.” Well, 8GB has been the baseline with Apple for over 10 years, and will most likely remain so with their unified architecture. Pro-users will buy more memory, but these users will definitely not buy your 3 year old 16GB second hand mac. Meaning the extra money you payed for 16GB will not result in a premium second hand value. The audience for your 2nd hand mac will more likely be first time users, or those looking for aRead More →