I've been struggling to set up a valid configuration to open a connection with a second machine, passing through another one, and using an id_rsa (which requests me a password) to connect to the third machine.

I've asked this question in another forum, but I've received no answer that could be considered very helpful.

The problem, better described, goes as follows:

Local machine: user1@localhost
Intermediary machine: user1@inter
Remote target: user2@final

I'm able to do the entire connection using pseudo-tty:

ssh -t inter ssh user2@final

(this will ask me the password for the id_rsa file I have in machine "inter")

However, for speeding things up, I'd like to set my .ssh/config file, so that I can simply connect to machine "final" using:

ssh final

What I've got so far -- which does not work -- is, in my .ssh/config file:

Host inter
    User user1
    HostName inter.com
    IdentityFile ~/.ssh/id_rsa

Host final
    User user2
    HostName final.com
    IdentityFile ~/.ssh/id_rsa_2
    ProxyCommand ssh inter nc %h %p

The id_rsa file is used to connect to the middle machine (this requires me no password typing), and id_rsa_2 file is used to connect to machine "final" (this one requests a password).

I've tried mixing up some LocalForward and/or RemoteForward fields, and putting the id_rsa files in both first and second machines, but I could not seem to succeed with no configuration whatsoever.

Hope somebody can help me here!

Regards!

P.S.: the thread I've tried to get some help from:

http://www.linuxquestions.org/questions/linux-general-1/proxycommand-on-ssh-config-file-4175433750/