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

[michaelof at rocketmail.com]

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


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.
>