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Hi,
As to the Netgear router, the PC and Dreambox are plugged into it because the Zyxel modem simply has no (ethernet?) ports to plug them in directly.
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OK. I understand now. You just don't have enough physical plugs in the Zyxel modem, so you're trying to use the Netgear more as a
[Only Registered Users Can See LinksClick Here To Register] than anything.
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I changed the forwarding address in the modem to the IP address of the router. Port 12000 still remains closed.
As you proposed I had a closer look at the firewall in the modem. I briefly inactivated the firewall in the modem to see what happens. It results in port 12000 being open. I activated the firewall again and added a line to the rules of the firewall:
Packet direction: WAN to LAN
Source IP: any
Destination: <IP address router>
Service: Any(UDP)
Action: Permit
This results in port 12000 being open and (at least) 1 client connected.
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So, the firewall was a problem. As people have said, it is TCP rather than UDP you need for cardsh!aring. I would be a bit concerned that you have even one client connected. CCcam uses TCP. As far as I know, UDP alone will not work for CCcam. Someone will correct me if this is wrong.
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Two new questions occur to me:
1. Could you please comment if the additional line I added in the firewall of the modem is safe? Is there a "security hazard" in doing so?
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It doesn't sound absolutely safe. There is always a danger opening ports, as someone has said, but your single rule is causing unexpected (for me) results. You should check if that is really the only rule in force.
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2. At "Service" one can choose Any(UDP) or Any(TCP). Does it matter? (I chose Any(UDP)).
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TCP alone will do it. Again, I don't think UDP alone should work.
No problem.
As you've seen, this type of setup is quite complicated and difficult to make work properly.
What someone would ordinarily do, would be either to:
1.) Use the router as the modem, but this is not an option for you, because that model has no A/DSL.
2.) Bridge the Zyxel to your Netgear router.
This will make things much simpler. You will have only the Netgear firewall and port-forwarding to worry about, and will not have to worry about possibly inconsistent rules.
Please post back and let us know what you decided and how things are working!
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You could also try disabling NAT in the Netgear router, if this setting is easily changed. That should make the Netgear behave like the hub you are trying to use it for now. You might not want to do this, though. At some point, you might decide having wireless is something you do want.