I'm very interested in making SSH use UDP for large data chunks. Maybe
you know FASP
(https://en.wikipedia.org/wiki/Fast_and_Secure_Protocol), but that is
proprietary, although the website says it's based upon open source
methods.
Is it possible to make openssh work with UDP for this purpose?
I guess your original problem is
SSH/SCP/RSYNC etc. is too slow.
The right solution to that depends on the exact use case.
a) High speed low latency connection (LAN, 10Gbit) -
Tune your TCP stack and choose a _very_ fast encryption
algorithm in SSH
sysctl for Linux:
net.ipv4.tcp_rmem = 65536 131072 6291456
net.ipv4.tcp_wmem = 65536 131072 4194304
b) High speed high latency connection (WAN, 1Gbit) -
Above, plus choose a different congestion control.
$ sysctl net.ipv4.tcp_congestion_control
will give the current set one; which are available
depends on the installed kernel modules.
("depmod -n | grep tcp_" might be a first hint)
ISTR that there was/is a way to choose the congestion
control via iptables or per-program or so, but I don't
remember the details offhand.
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