funny thing, same question...
But I'm looking for the connection between two GAiA gateways, not from a gateway to the internet.
SCP is possible but if you have a bigger line between the gateway SCP is the limitation of the throughput.
I found "netcat" is available in GAiA an with this you can copy data from one gateway to another. This will work but it's not nice to use.
nc -v -v -l -n -p 2222 >/dev/null
sending gateway :
time yes|nc -v -v -n x.x.x.x 2222 >/dev/null
x.x.x.x 2222 (rockwell-csp2) open
Total received bytes: 0
Total sent bytes: 2277M (2277199872) (you must convert this to bits and divide by the time running the test, result is around 300Mbit/s in this case for 1minute)
Any other ideas?