> I'd like it if TCP could catch these...

It can't.   Get over it!   Seriously, though, on an ethernet you don't
see this kind of corruption to an extent that matters, and on leased
lines, link-level diagnostics will turn up the problem before it bites
you on the ass.   It's only when you see error rates like this...

   sl0   296   <Link>                      49043  1389    68693     0  0
   sl0   296   204.182.18  204.182.18.1    49043  1389    68693     0  0

...that you see the occasional corrupt packet slip through the header
checksum.   Nonetheless, since a lot of us NetBSD hackers are in fact
on the other end of slip or ppp connections, a 32-bit CRC in sup would
be a big win.

			       _MelloN_
--
Ted Lemon							 mellon@vix.com
+1 415 567 7999