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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
...gzilla
>> (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?
>
> Your IPv6 _route_ has 3 times the latency:
>
> ? $ time /usr/sbin/traceroute vserver.domain.tld
> ? ...
> ?? 7? domain.tld (IPv4)? 26.002 ms !X? 24.859 ms !X? 25.230 ms !X
>
> ? $ time /usr/sbin/traceroute6 vserver.domain.tld
> ? ...
> ?? 8? domain.tld (IPv6)? 80.430 ms !X? 79.301 ms !X? 80...