ssh redirect without using port forwarding

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I am looking for a way to redirect an
ssh connection from one host to another. When a user creates an ssh connection to host
foo, I would like the server to return some response which causes the ssh client to
close the ssh connection to foo and instead connect to host
bar.

Importantly, for the application
I have in mind it is not okay to simply forward the ssh connection to bar via foo, so
standard port forwarding is out of the question. Once the redirection occurs, the client
should be sending TCP packets directly to bar, not to foo (and not to bar via
foo).

So, roughly, I'm looking for an SSH
analogue to an HTTP redirect (which causes the client to hang up the original connection
and connect instead to the host to which it was
redirected).

It is also important for the
application I have in mind that this not require any client-side
configuration.

So is it possible to do
this?

Answer

There is no provision in the SSH protocol
for redirects. Read RFC 4251, rel="nofollow noreferrer">RFC 4252, and href="https://tools.ietf.org/html/rfc4253" rel="nofollow noreferrer">RFC
4253 for details of the connection negotiation.

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