RE: Error Recovery in FTP

[Tim McCarthy <TimM@xxxxxxxxxxxxxxxxxx>]

FTP doesn't handle lost or garbaged data because the lower transport
layer - TCP handles it. TCP segments are checksum protected. 

> -----Original Message-----
> From: Rob Berendt [SMTP:rob@dekko.com]
> Sent: Thursday, March 18, 1999 8:25 AM
> To:   MIDRANGE-L@midrange.com
> Subject:      Re: Error Recovery in FTP
> 
> In ANSI x.12 EDI there are hash or control totals built in and some
> optional ones.  Perhaps we need to 
> follow this concept in datafiles that we transmit using FTP.
> 
> 
> 
> 
> 
> LiuKeanKeong@hlbb.hongleong.com.my on 03/18/99 12:24:33 AM
> Please respond to MIDRANGE-L@midrange.com@Internet
> To:   MIDRANGE-L@midrange.com@Internet
> cc:    
> 
> Subject:      Error Recovery in FTP
> 
> I read from the FTP Specification RFC 959 that there is 'no provision
> for detecting bits lost or scrambled in data transfer'. A restart
> procedure is provided to retransmit but controlled at user application
> level. (compared to SNA which handles it for us at a lower level?)
> 
> Does this mean that there is a remote chance that a FTPed file may
> have
> bits that are in error? In which case we would need to program in a
> checksum feature into our FTP file transfer programs? I mean, for
> critical data files.  not for bitmap, jpg or wav files which are
> tolerent of bit errors!  :-)
> 
> any comments welcomed. thanks.
> 
> kk liu.
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