Duplicate ports

Lawh

Hey!

I have an issue where I need to forward the same ports for multiple devices. I get an error for a duplicate port but the address these ports are forwarded to are different. I think this might be an error on the device, that it does not understand that multiple devices need to sometimes have the same ports forwarded.

Any help is appreciated, thanks!

PeterUK

But you have to understand the limitation of NAT and only having one WAN IP for example a TCP port 88 is say forwarded to 192.168.0.88 and 192.168.0.99 both see the SYN and reply with SYN, ACK due to the protocol limitation both devices built up the connection causing the the other to fail not knowing which device you wanted to connect to.

On high end firewalls you can do source IP NAT so the from x.x.x.x to 192.168.0.88 and the rest to 192.168.0.99 for the same port

UDP has about the same problems unless the protocol for UDP is written to support it but no one has (that I know of) so port forwarding for UDP has the same limitation as TCP.