harryc: Taky moc dík za info.
Tak se mi to podařilo aspoň částečně zprovoznit. V Advanced > Application jsem si přidal další položku s parametrama:
Trigger port: 1023 - 11000 (EDIT: Zdá se, že stačí 1935)
Trigger type: Both
Public ports: 1023-20000 (ten horní port by měl být vyšší (dostávám to z náhodnýho portu, takže to funguje tak v 50% případů), ale zatím se mi to mlátí s dalším nastaveným pravidlem, takže to nechám tak)
Public type: Both
Určitě to není ideální nastavení, budu si s tím ještě hrát.
Pro ty, co nemají D-Link sem aspoň hodím část z nápovědy (třeba se vám podaří najít podobnou položku na svým routeru):
Special Applications
Some applications require multiple connections, like Internet games, video conferencing, Internet telephony and others. These applications have difficulties working with NAT (Network Address Translation). Special Applications allows some of these applications to work. If you need to run applications that require multiple connections,specify the port normally associated with an application in the "Trigger Port" field, select the protocol type as TCP (Transmission Control Protocol) or UDP (User Datagram Protocol), then enter the public ports associated with the trigger port to open them for inbound traffic. At the bottom of the screen, there are already defined well-known special applications. To use them, click on the edit icon and enable the service.
Name :This is the name referencing the special application.
Trigger Port :This is the port used to trigger the application. It can be either a single port or a range of ports.
Trigger Type :This is the protocol used to trigger the special application.
Public Port :This is the port number on the WAN side that will be used to access the application. You may define a single port or a range of ports. You can use a comma to addmultiple ports or port ranges.
Public Type :This is the protocol used for the special application.
If the mechanism of Special Applications fails to make an application work, try using DMZ host instead.
NOTE: At any time, only one PC can use each Special Application.