ssh keys - local and remote keys

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Hello.
I have three machines that I use, which all have their own ssh keys.
On two of them I have the keys stored on an external build server so that
when I interact with them, the authentication is using my local ssh keys,
whereas the third local machine doesn't have the keys stored there,
and I can't add the key myself.

On the third machine where I don't have the ssh key stored on the build server,
I plan to start using it to interact with the build cluster.

So, how do I tell ssh to use agent forwarding and use my local key when
interacting with the build cluster, and prevent it from using the keys on
the third computer when I ssh into the third system to interact with the
external build server from the third system?

- --
Solbu - http://www.solbu.net
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PGP key ID: 0xFA687324
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