8 May
2022
8 May
'22
1:14 a.m.
On Sat, May 7, 2022 at 10:23 AM ron minnich <rminnich(a)gmail.com> wrote:
IP4 padding came up recently: the ip command
interprets 10.2 as
10.2.0.0, whereas most things (golang libraries, ping, ...) interpret
it as 10.0.0.2. The latter interpretation accords with what I learned
40y ago.
10.2 is ambiguous. In a network context, it means, typically, 10.2.0.0/16
(though your mileage may vary).
In a host context, it means 10.0.0.2. It's this confusion that has lead to
many efforts
to outright kill this notation.
But, I find myself wondering: where was the first use
of the IP4 zero
padding convention?
I know that it was around in the late 80s on TOPS-20 TCP/IP at Stanford,
and in 4.2BSD (4.1c?). It may have also been in use at MIT. It's usage
pre-dates my 1984 joining of the internet...
Warner