forwarding

eteenpäin lähettäminen

edistäminen (present participle of)
The act by which something is forwarded.
2005, Daniel J. Barrett, ‎Richard E. Silverman, ‎Robert G. Byrnes, SSH, The Secure Shell: The Definitive Guide

You might think that the GatewayPorts feature discussed in the last section applies equally well to remote port forwardings. This would make sense as a feature, but as it happens, it isn't done.