I need a simple TCP load balancer in Ubuntu

I would like to create a load balancer for RDP connections only, that’s one TCP port only and would like to avoid anything more complex like Nginx.

I don’t need cache, or anything else, just take an incoming tcp connection and establish an internal connection to one on N servers with less connections. Once the connection is dropped, if restablished, it can be sent to any other server.

I read about a project called Balance from more than 10 years ago but it is gone, so I’m looking for an active project.

Any hints? Thank you all

pen it will have and use features you list as not needed but the tool is so easy to use I am going to ignore you on those ;-)

Pen is a load balancer for udp and tcp based protocols such as dns, http or smtp. It allows several servers to appear as one to the outside and automatically detects servers that are down and distributes clients among the available servers. This gives high availability and scalable performance.

The load balancing algorithm keeps track of clients and will try to send them back to the server they visited the last time. The client table has a number of slots (default 2048, settable through command-line arguments). When the table is full, the least recently used one will be thrown out to make room for the new one.

pen 80 www1:8000:10 www2:80:10 www3

Here three servers cooperate in a web server farm. Host www1 runs its web server on port 8000 and accepts a maximum of 10 simultaneous connections. Host www2 runs on port 80 and accepts 10 connections. Finally, www3 runs its web server on port 80 and allows an unlimited number of simultaneous connections.

Oh and "In part inspired by balance by Thomas Obermair.".