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

With openssh version 7.3 and up it is easy. Use ProxyJump option in the config file.

# Add to ~/.ssh/config 
Host bastion
    Hostname bastion.client.com
    User userForBastion
    IdentityFile ~/.ssh/bastion.pem

Host appMachine
    Hostname appMachine.internal.com
    User bastion
    ProxyJump bastion                   # openssh 7.3 version new feature ProxyJump
    IdentityFile ~/.ssh/appMachine.pem. #no need to copy pem file to bastion host  

Commands to run to login or copy

ssh appMachine   # no need to specify any tunnel. 
scp helloWorld.txt appMachine:.   # copy without intermediate jumphost/bastion host copy.** 

ofcourse you can specify bastion Jump host using option "-J" to ssh command, if not configured in config file.

Note scp does not seems to support "-J" flag as of now. (i could not find in man pages. However above scp works with config file setting)