TCP and UDP have ports. These are 16 bit; there are 65535 or so per IP address. These protocols don't care to differentiate between the ports. Elsewhere, IANA presumes to operate a process to allocate "well-known" ports in the range 1-1023, "registered ports" in the range 1024-49151, and to reserve the remainder, 49152–65535, for "ephemeral" ports. The caller end has to have a port, which is how replies get back within the virtual connection, and these are conventionally picked from the ephemeral range by the OS's networking stack. The whole idea of ports is ridiculous, because it allows ISPs to arse around presuming to decide which services they will "not allow". Anything that allows IPSs to do anything other than shift opaque packets will allow ISPs to meddle and break things, and due to the Law of Meddling, if they can, they will. I am currently working around an issue with Claro, a pretend ISP, blocking port 5060, allocated to SI...
Taleb observed in Antifragile that it took 6000 years between the invention of the wheel, and someone putting wheels on luggage. Sadly, castors without brakes result in a lot of rolling around. This is getting worse each year, as the luggagetards seem to take unbounded delight in reducing the friction in their castors, but never add brakes. Thousands of people are going round announcing they "work in luggage design", but not a single one has implemented the most obvious and beneficial "innovation" available to them. I have so far been unable to (spot test and) buy any luggage with brakes on the wheels, despite asking in several luggage shops. Searching online yields promises of "universal" castor parts with brakes, where "you must have a strong ability in DIY", meaning: they're not universal, and the fitter may as well be crafting the whole item from scratch. It also brings up a 700 EUR piece of Chinese tat, with no brakes visible in the...
If you sit in a seat, and you put your feet on, or push your legs against, the seat in front, you are a seat prick. If the person whose seat you are messing up asks you to stop, and an hour later you are doing the same thing again, you are a very bad seat prick. If you yank on the head of someone's seat, to heave yourself up, you are a bad seat prick. If you recline your seat into someone else's space, and it's not night time, you are a recline seat prick. These are the basic types of seat prick: seat prick, bad seat prick, very bad seat prick, and recline seat prick.
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