Subject: Re: rdist vs. sup
To: Greg A. Woods <email@example.com>
From: John F. Woods <firstname.lastname@example.org>
Date: 03/04/1995 08:32:18
> It kind'a bugs me a great deal that the networking code in NetBSD *can*
> allow errors to creep into a TCP circuit!
There being only 65,536 different TCP checksum values, there is a 1 in
65,536 chance that purely random data will successfully TCP checksum.
Of course, corrupted IP packets aren't (quite) random data. The TCP/IP
checksum is fairly strong against certain kinds of errors -- but it is
notably weak against other kinds of errors. As my little anecdote
showed, if you have a *bad enough* link, TCP's stubbornness inevitably
means that it passes some bad data along with the good.