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2018 Nov 07
4
openssh-based file transfers (e.g. rsync, scp, ...) are running 40 (!!) times faster via IPv4 than IPv6
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
2018 Nov 07
2
openssh-based file transfers (e.g. rsync, scp, ...) are running 40 (!!) times faster via IPv4 than IPv6
...X
>
> ? $ time /usr/sbin/traceroute6 vserver.domain.tld
> ? ...
> ?? 8? domain.tld (IPv6)? 80.430 ms !X? 79.301 ms !X? 80.444 ms !X
>
> The big time waster seems to be this link:
> ?? 6? nug-d-i40-v6.telia.net (2001:2000:3018:8d::1)? 32.046 ms? 23.850 ms? 24.097 ms
> ?? 7? contabo-ic-305268-ffm-b11.c.telia.net (2001:2000:3080:953::2)? 74.829 ms? 77.704 ms? 78.066 ms
>
> I'll now speculate that you might as well have some MTU mismatches,
> meaning that packages have to get split up along the way, further
> slowing down your connection.
>
> Do you have...