So while I have glanced through the forms to find if someone else has had the same issue, but I feel like my situation is particularly isolated/special. (I guess anyways)
I am trying to run the rdesktop/remote desktop application through my modem/router and my Ubuntu DHCP server to a system on the subnet(or sub-lan). I have forwarded the port (3389) through my modem/router and have it redirect the traffic to my Ubuntu DHCP server. From that, using netstat, the port 3389 is not blocked but closed (on my DHCP server)(not sure if it matters that it needs to be listening?). When I check to see if the port is open (through the modem/router and DHCP server), the results I have gotten say that the port is still closed. I know the packet is making it pass the port on the router/modem because I have remotely connected to a system on the LAN through the modem/router successfully. Due to my setup however I wish to remotely access the system from the sub-lan. (modem/router --> LAN --> DHCP server --> sub-LAN/net, incase the terminology seems confusing.)
Can anyone offer a solution? I can work around this but my ideal setup should be possible? (at least I think so)
Here is my iptable(s) content, thank you!
/sbin/iptables -P FORWARD ACCEPT
/sbin/iptables -A FORWARD -i enp5s0 -j ACCEPT
/sbin/iptables --table nat -A POSTROUTING -o enp0s25 -j MASQUERADE