[Info-vax] FTP sesion against a vms server fails

[H Vlems]

On Aug 6, 2:18 pm, John Wallace <johnwalla... at yahoo.co.uk> wrote:
> On Aug 6, 5:16 am, moro... at world.std.spaamtrap.com (Michael Moroney)
> wrote:
>
> > I have also noticed some FTP funniness with VMS (V8.3 Alpha).  On my LAN
> > (all systems 100BT), FTP from one PC running XP works, but is very slow.  
> > From another PC running XP, it runs at normal speed.  In each case the FTP
> > client is the basic simple Windows client (DOS window->ftp).  Since I
> > rarely FTP from the "slow" system, I haven't investigated further.
>
> Based on experience (rather than evidence), stuff like that is often
> down to physical layer issues - autonegotiate mismatch, duplex
> mismatch, speed mismatch, etc. Either genuine hardware issues or maybe
> just driver misbehaviour. Either way, a $10 network card might help
> quickly identify where the problem lies.
>
> Back to the OP though.
>
> Wireshark (formerly Ethereal) is a wonderful tool for knowing what's
> been happening in IP packet terms on a PC. If I recall correctly some
> VMS IP stacks have their own packet-trace facilities too.
>
> A log of the packet exchange between PC and VMS system would allow
> folks to be making evidence-based suggestions rather than the educated
> guesses we're getting so far.
>
> Also, a less ambiguous problem description might be helpful. I *think*
> the ftp failure problem summary is:
> pc1 -> vms1 : ftp fails
> pc1 -> vms2 : ftp fails (identically?)
> vms1 -> vms2 : ftp OK
>
> To date, the definition of "fails" unfortunately does not include the
> exact commands issued and the exact results they generated, or any VMS
> OPCOM output which might potentially be relevant.
>
> Best suggestion I've seen so far is VAXman's request to use telnet to
> manually drive ftp and note the exact results, though later on, the
> same logic VAXman uses to deduce that the problem must be in MS
> territory ("VMS ftp always works for me so the problem must be
> Windows") is the same logic most folks would normally use to point the
> finger at VMS in this picture ("Windows ftp always works for me so the
> problem must be VMS").

Correct. Put either the PC of the VMS system at 100 Mb/s half duplex
and ftp will work.
The problem IMHO lies with the way cheap switches are designed and
made.
Hans