Port forwarding with bind address
Sometimes it is useful to forward a port for a specific address like
ssh -L 127.0.0.1:80:intra.example.com:80 gw.example.com
The Host "intra.example.com" is reachable just from the local machine or an another specified IP address.
You can get a detailed description and a use case here
I had the same requirement for remote port forwarding. There I also need to define a bind address.