On Wed, Jan 17, 2018 at 1:12 PM, Frank McConnell via cctalk < cctalk@classiccmp.org> wrote:
> > On Jan 17, 2018, at 10:18, Warner Losh via cctalk <cctalk@classiccmp.org> > wrote: > > > > On Wed, Jan 17, 2018 at 5:40 AM, Noel Chiappa via cctalk < > > cctalk@classiccmp.org> wrote: > > > >> http://minnie.tuhs.org/cgi-bin/utree.pl?file=BBN-V6 > >> > >> (The latter includes NCP as well as TCP/IP.) > >> > > > > I'm curious: does it inter-operate with modern TCP/IP implementations? > > This is a more serious question than one might think, but I know you > (Warner) have been around long enough to have gone to Interop when it was > about improving network interoperability. > > So here's a real example: I have an HP 3000 Micro GX with MPE G.A3.09 > (V-delta-9) which is very 1990. And it has a LANIC, and V-delta-9 is late > enough for it to be able to do IP over Ethernet (vs. V-delta-4 and before > which could only do IEEE over 802.3). And it has an FTP client. > > So you might think I'd be able to move files between it and a modern > FreeBSD box, right? I mean, it's all just Ethernet, right? > > Where it falls apart is that there's a bug in HP's TCP/IP ("NS Transport") > in V-delta-9 and before, such that it tears down the connection with a > failure if a packet is received with IP type-of-service not zero. And the > FreeBSD FTP server sets a socket option that gets FreeBSD to send that sort > of packet. > > At a previous employer, I went round with HP a bit on behalf of a mutual > customer and got HP to issue a patch for NS Transport that corrects this > behavior on the MPE side. Clearly, I don't have that patch on this system. > > FreeBSD is FreeBSD, and I can build its FTP server from source and change > it so it works in this situation; but I think this should give y'all some > idea of the hilarity that can ensue when you exhume a 1980s TCP/IP and put > it on your network. > A pre-Interop TCP/IP at that :) It's kinda why I was asking... Warner
