There are three machines, all running freebsd. #1 and #3 ties no, but there is a connection through #2 (different network). How to copy a very large amount of data with the #1 machine on #3 with #2? Data is measured in TB, so leave them on the intermediate #2 — a bad option.
Tried to do it through mc at #2 on the left side where you connect to #1, and the right to #3. But through a quantity of file mc constantly gives error "No space left on device (28)", meaning #3, but it is certainly not true.
What other ways are there?