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Sending files with scp via 2 intermediate hosts

Sending files with scp via 2 intermediate hosts

I need to copy files with scp from host A to host D, where D is reachable only via host C. This is normally done by using a proxy:

ProxyCommand ssh -W %h:%p C

Now, due to some network issue, the copy is very slow (about 100 KB/s). However, I can copy files from host A to some other host B and from host B to host D (via C) both at a reasonable speed (more than 10 MB/s). The issue is that host B has little free space on the disk. So I need to instruct scp that on B, data need to be sent immediately to D (via C) instead of being stored on B.

I thought that a ProxyJump would be the solution, e.g.

scp -J B,C file D:

but this doesn't solve the slowness issue, which is still 100 KB/s.

What is the correct method?

Note: As a workaround, I can type on host B:

scp -3 A:file D:

(where a ProxyCommand is used in the ssh configuration for host D as mentioned above), and the file transfer is fast. So I would like some equivalent for a scp command typed on host A.


Top Answer/Comment:

Comment: Another workaround is to create a tunnel from D to A with ssh -f -N -R 4000:localhost:22 A, and on A, use localhost:4000 instead of D. This is a way to bypass C, where the problem probably lies. But this doesn't answer the question of having a method directly usable from host A.

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