openssh-based file transfers (e.g. rsync, scp, ...) are running 40 (!!) times faster via IPv4 than IPv6

[Vincenzo Romano]

Il giorno mer 7 nov 2018 alle ore 19:30 michaelof at rocketmail.com
<michaelof at rocketmail.com> ha scritto:
>
> Vincenzo,
>
>
> thanks for answering !!!
>
> As I found out before that this slow down only happens for encrypted transmissions, I've followed your suggestion and
> tested with a https-based download, from my Nextcloud instance on my VPS.
>
> Same slow speed when connecting via IPv6, and as fast as expected when connecting via IPv4.
>
> Just to confirm: There's NO dependency/relation between openssh and https, on Linux, correct? (Web Server is Apache)
> If NO, sorry for wasting your time, and again THANK YOU for leading me into another direction!
>
>
> Regards,
> Michael

libssl could be a common factor.
Try FTP, please.

>
>
> Am 07.11.18 um 19:05 schrieb Vincenzo Romano:
> > Il giorno mer 7 nov 2018 alle ore 17:58 michaelof at rocketmail.com
> > <michaelof at rocketmail.com> ha scritto:
> >>
> >> openssh 7.6p1-lp150.7.4 on OpenSuse Leap 15 (both server and client)
> >>
> >>
> >>
> >> Hi all,
> >>
> >>
> >> first post to list, hopefully on-topic. Haven't found anything on the net, tried to ask at first in OpenSuse forums a
> >> while ago (https://forums.opensuse.org/showthread.php/533588-rsnapshot-rsync-massive-performance-decrease) and today
> >> opened a bug in OpenSuse's Bugzilla (https://bugzilla.opensuse.org/show_bug.cgi?id=1115075)
> >>
> >> As written in bug report, as general network issues could be excluded, any hints where to start, how to narrow down if
> >> this is a specific openssh issue or something else?
> >>
> >>
> >> Thanks in advance,
> >> Michael
> >
> >
> > Can you try the same transfer with a (totally) different protocol,
> > like FTP, NFS, CIFS?
> > This is to exclude any network-related slowdown.
> >



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Vincenzo Romano - NotOrAnd.IT
Information Technologies
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