FTP Restart problem

[Guest_imported]

We are having an odd problem with FTP transmission. We have a Dec Alpha and an HP 9000 V2500 co-located in London, on the same FDDI LAN. There are automatic FTPs from the Dec to the HP (none in the other direction). The transmissions restart several times before completing successfully. It doesn't matter if the file is 100kB or 100MB. Here's the odd part, if we reconfigure to FTP to an HP here in Reston Virginia first, then forward on to the HP in London, there is no problem. Any ideas on why an FTP between two co-located boxes has so many problems, but sending the files across the big pond works fine?

 

[MikeLacey]

This is like the classic test for a bad network link isn't it...

If something like NFS (a app that uses the UDP protocol) transfers files but corrupts them - and something like FTP (an app that uses the TCP protocol) does things successfully it points to the network link.

Sounds (to me) as if that might be the case here - that particular interface is suffering some problems.

Do you have any retransmission (etc) stats for that link? Mike
michael.j.lacey@ntlworld.com
Email welcome if you're in a hurry or something -- but post in tek-tips as well please, and I will post my reply here as well.

 

[Guest_imported]

I am trying to get some stats, but it may take awhile. Are there specific commands that I should ask the network folks to run that would help you help us?