A partir da documentação puTTY , especificamente, 4.23 The Tunnels Panel seção:
Set one of the ‘Local’ or ‘Remote’ radio buttons, depending on whether you want to forward a local port to a remote destination (‘Local’) or forward a remote port to a local destination (‘Remote’). Alternatively, select ‘Dynamic’ if you want PuTTY to provide a local SOCKS 4/4A/5 proxy on a local port (note that this proxy only supports TCP connections; the SSH protocol does not support forwarding UDP).
- Local - Encaminhar porta local para host remoto.
- Remota - Encaminhar porta remota para o host local.
- Dinâmico - Use SOCKS.