How to scp with a second remote host

Question

I wonder if there is a way for me to SCP the file from remote2 host directly from my local machine by going through a remote1 host.

The networks only allow connectio

Answer 1

There is a new option in scp that add recently for exactly this same job that is very convenient, it is -3.

TL;DR For the current host that has authentication already set up in ssh config files, just do:

scp -3 remote1:file remote2:file

Your scp must be from recent versions.

All other mentioned technique requires you to set up authentication from remote1 to remote2 or vice versa, which not always is a good idea.
Argument -3 means you want to move files from two remote hosts by using current host as intermediary, and this host actually does the authentication to both remote hosts, so they don't have to have access to each other.
You just have to setup authentication in ssh config files, which is fairly easy and well documented, and then just run the command in TL;DR

The source for this answer is https://superuser.com/a/686527/713762