Hello,

Heaps of data goes over this link, apparently without error and it has been
doing it for at least a year. Isn't it likely that I would have seen TCP
errors throw up problems with other s/w by now?

If the data is being tampered with it would have to be SSH or the kernel
wouldn't it?

Cheers, Peter.

On Tuesday 15 July 2008 10:02:42 Holger Parplies wrote:
> Hi,
>
> Peter Nankivell wrote on 2008-07-15 09:17:48 +1000 [Re: [BackupPC-users] 
aborted by signal=PIPE errors.]:
> > [...]
> > If it is all due to ssh and hardware it makes me worry about
> > the resilience of ssh.  Surely its protocol should be able to
> > retry on corrupted data?  I don't know...
>
> actually, TCP should provide ssh with a reliable data stream. If ssh *sees*
> corrupted data, then either
>
>   1) the data has been tampered with or
>   2) TCPs CRC failed to identify network data corruption.
>
> While (2) is conceivable, it should *not* be happening on a regular basis
> (if it is, something else is wrong). I would guess it to be so rare that
> ssh ignores the possibility, since there is no way to distinguish between
> both cases. In the case of tampering, retransmissions would not make much
> sense ("Hey, I noticed that! Be more subtle next time." :-).
>
> > Another solution maybe to use "rsyncd".  This should avoid
> > using ssh as the transport.  I haven't tried this yet.
>
> Providing you really have a corrupted TCP data stream, that would mean
> corrupted backups ... or an rsync protocol failure.
>
> Regards,
> Holger



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