I have the following problem. We install cable internet service with Thomson Router DWG855 with Dynamic IP. We install surveillance cameras and DVR Zmodo, but we could forwarding to the WAN, because ports 81, 5050, 6050 and 7050 are not open even though you have set the forwarding and enable the LAN port and output ports. Please give me your help to solve this. Atte. Sorry for my english, i know little.
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First: check with your ISP, they may be blocking those ports inbound, in which case you're done.
Thanks ...... I will try what you recommended .....
My ISP say me that this router only forwarding port with Static IP.... will be truth