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

[michaelof at rocketmail.com]

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