I want to set up a Ubuntu openssh (or telnet) server where the network environment is
can connect to any other host via any tcp/udp port.
but cannot accept incoming connections from other clients.
no UPnP in NAT
Is there any solutions to control this server from outer network?
- the server A connects to a outer server B.
- user connects to the server B.
- server B redirects any packets from user to server A.