make sure you forward the right netsend/receive port to the right local IP
Does that mean if i know the right port i only have to specify the routers IP and this port-number in the connecting-message? if yes, how can i find out the "right" port?
when you use netsend/netrecieve *you* chose the port... so, on your firewall forward the port number you chose in your patch to the ip of your pc on teh local network.