How to use ssh-agent with multiple (valid) keys and yet choose which one to use?

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http://unix.stackexchange.com – Let's say there are two keys A and B, both of which are valid for user@host public key authentication. Since authorized_keys is configured for different behaviour depending on the key, ~/.ssh/config on the client uses something like Host A.host HostName host User user IdentityFile ~/.ssh/A Host B.host HostName host User user IdentityFile ~/.ssh/B That works fine. However, the moment I use ssh-agent and add both keys A and B (e.g. in order to enter their passphrases at login instead of when I call the respective ssh A.host or ssh B.host), the connection will always us (HowTos)