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I have my modem with 4 ports. 1 is linked to the router while 1 is linked directly to my computer. Now I can access my webserver with some 42.2.xxx.xxx:xxxx in my computer. But my friend reported to me that he cannot access it on his computer. Is there anything to do with the router?

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Need a little more info here... Where is your web server at? Is it behind the router? Please paint us a better picture of your network. –  Tanner Nov 1 '12 at 15:31
    
It sounds like you actually have two routers. If your "modem" has four ports, it almost certainly has a built-in router. It's very easy to mess up a configuration like that. For example, if you connected your router's "Internet" (or "WAN") port to the modem, that's a problem, since you've actually connected it to one of the modem's LAN ports, not a WAN. It's almost impossible to get port forwarding working with double-NAT. –  David Schwartz Nov 1 '12 at 17:45
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