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

[michaelof at rocketmail.com]

Philipp,


thank you so much for your valuable hints!!

BUT as this list's topic is OpenSSH, and as I now know that my issue has NOTHING to do with OpenSSH, I would like to
stop here, not wasting anyone's time.

Thanks to Vincenco's FTP hint I've now tested with a Debian based "rescue live system" instead of my OpenSuse based VPS,
on server side, offered by my VPS's hosting company. And on the client side with my Android smartphone and the (FOSS)
"Ghost Commander" instead of my OpenSuse box at home. To be sure that my issue has also nothing to do with OpenSuse, as my
preferred Linux flavor.

And in fact it has nothing to do with either OpenSSH or OpenSuse....


Thanks again,
Michael


Am 07.11.18 um 22:18 schrieb Philipp Marek:
> 
>> Unfortunately the traceroute(6) results are both more or less random.
>> Sometimes traceroute "hangs" a while, wherever,
>> sometimes traceroute6. Sometimes traceroute is faster, sometimes
>> traceroute6. Not reliable.
> That might just as well be DNS issue; the reported latency
> values are the interesting data.
> 
> 
>> Your MTU question, tried as adviced:
>>
>> Maximum size for IPv4 is 1466, and max size for IPv6 is 1444.
>> Exceeding these values leads to a "ping: local error:
>> Message too long, mtu=1492" in both cases.
> Hmmm, the IPv6 header is 20 bytes longer than IPv4 -- so there
> are still 2 bytes missing.
> 
> Please try to set the MTU manually smaller, eg. to 1400,
> and test once more.