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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Chinese downloads overloading my website
Date: Fri, 15 Mar 2024 05:42:50 -0700
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On 3/15/2024 4:33 AM, Peter wrote:
> 
>   Don Y <blockedofcourse@foo.invalid> wrote:
> 
>> I operate a server in stealth mode; it won't show up on
>> network probes so robots/adversaries just skip over the
>> IP and move on to others.  Folks who *should* be able to
>> access it know how to "get its attention".
> 
> Port knocking ;)

Effectively, yes.  It's a bit tedious to use -- and the server-side
code is far from "standard" -- but it is great at stealth.  I'm
not sure how it would work in situations with lots of *intended*
traffic, though...

[I've been making little boxes with a NIC on one end, stack
in the middle, and some form of communications I/O on the
other (serial port, USB, GPIB, CAN, DMX, etc.).  The stealth
feature was one of the most requested capabilities (as it lets
an interface be deployed and routed -- without fear of some
hacker/script-kiddie stumbling onto it and dicking with the
attached device).]