fling transfers data quickly over a trusted network. It does not encrypt the data. It tries to avoid copying data between kernel and userspace where it can; you will see the most improvement over other tools like netcat on systems with low memory bandwidth. fling is extremely Linux-specific, as almost all the optimisations used beyond what other similar tools do are non-portable.
You need to run fling on both ends of the transfer. Run it first on the receiver:
fling -r 12756 > file.dat
And then on the sender:
fling other.host.address 12756 < file.dat
Note that sender reads the data from its stdin, receiver writes it to stdout.
You can have fling run fling on the remote end over ssh. This avoids
having to start it manually, in a different terminal. You still need
the fling executable on the remote end. If it's not in the PATH, you
can set the FLING_REMOTE_EXE environment variable to specify where
it is.
FLING_REMOTE_EXE="/usr/local/bin/fling" ./fling other.host:data < data
If your ssh command is not called ssh, you can set its name using the
FLING_SSH envionment variable.
The ssh support is currently experimental.
Get source code from https://github.com/rjek/fling and build it on
Linux by running the make command. Copy the fling binary to the
target host, or build a fresh copy there.
The wire protocol, i.e., what gets transferred over the TCP connection between two fling processes, is really simple. It is just the bytes of the input file to be transferred, no metadata, no checksum, and only one file allowed. This is to keep things as simple and fast as possible.
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