`ssh -NfR` equivalent with dropbear

I want to open a reverse tunnel in background. When using OpenSSH ssh -NfR 9022:127.0.0.1:22 <target> always worked. When I did that with dropbear on my router, it failed like this:

# ssh -NfR 9022:127.0.0.1:22 <target>
ssh: Exited: Error resolving '9022:localhost:22' port '22'. Name or service not known

ssh -R works fine, but doesn't start in background. Leaving either 'f' or 'R' didn't help; it printed the same error. Replacing the 127.0.0.1 with localhost didn't help either.

Please, SF, help me! :)

Dropbear does not support the short form of options, try this instead:

ssh -N -f -R 9022:127.0.0.1:22 <target>

`ssh -NfR` equivalent with dropbear

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