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1. Login to router<br />
2. Goto Advanced Tab<br />
3. Virtual Server from left<br />
4. If your server is not in the list add it from going to user.<br />
5. then add it to applied rule apply<br />
6. Save and restart the router.<br />
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I have done that and I have created all possible rules. As you can see from question, I said that i already had 3 virtual server rules for this specific IP address.
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I set up 3 virtual server rules for ports 8080,8090,8888 to route incoming requests to a local computer on router DSL-2640T.<br />
it never worked although i have tried everything.
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I set up 3 virtual server rules for ports 8080,8090,8888 to route incoming requests to a local computer on router DSL-2640T.
it never worked although i have tried everything.

Port Frowarding doesn't work on DSL-2640T

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations. Wireless telecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure. The key hardware components of a wireless computer network include adapters, routers and access points, antennas and repeaters.