Why can’t the router connect to Internet

cabledhcpinternet connectionrouter

I have UPC internet connection (chello.pl).
My router is D-Link DIR-300.
When I use provided modem to connect to the internet there is no problem.
When I try to do it via router, I can't get a connection.
I can log in to router and change its settings but the router does not "see" the internet.
I set connection type to dynamic IP address (DHCP).

In diagnostic mode on WAN cable I get:

TxPair Short Cable at 15 meters
RxPair Error at 15 meters
(note: no longer an issue)

How can I establish a proper connection?

EDIT:
ISP —–[concentric cable]—– modem —–[ethernet cable]—– PC (that works)
ISP —–[concentric cable]—– modem —–[ethernet cable]—– router —–[ethernet cable or wifi]—– PC (that doesn't work)

My modem is Scientific Atlanta model EPC2203 Cable Modem/EMTA.

ipconfig /all while connected without router (sorry it's not in English)

Konfiguracja IP systemu Windows

   Nazwa hosta . . . . . . . . . . . : PPC
   Sufiks podstawowej domeny DNS . . :
   Typ węzła . . . . . . . . . . . . : Mieszany
   Routing IP włączony . . . . . . . : Nie
   Serwer WINS Proxy włączony. . . . : Nie
   Lista przeszukiwania sufiksów DNS : chello.pl

Karta bezprzewodowej sieci LAN Połączenie sieci bezprzewodowej:

   Stan nośnika . . . .  . . . . . . .: Nośnik odłączony
   Sufiks DNS konkretnego połączenia :
   Opis. . . . . . . . . . . . . . . : Atheros AR9285 Wireless Network Adapter
   Adres fizyczny. . . . . . . . . . : 00-25-D3-DC-23-9F
   DHCP włączone . . . . . . . . . . : Tak
   Autokonfiguracja włączona . . . . : Tak

Karta Ethernet Połączenie lokalne:

   Sufiks DNS konkretnego połączenia : chello.pl
   Opis. . . . . . . . . . . . . . . : Realtek PCIe GBE Family Controller
   Adres fizyczny. . . . . . . . . . : E0-CB-4E-08-CE-97
   DHCP włączone . . . . . . . . . . : Tak
   Autokonfiguracja włączona . . . . : Tak
   Adres IPv4. . . . . . . . . . . . . : 89.74.136.19(Preferowane)
   Maska podsieci. . . . . . . . . . : 255.255.252.0
   Dzierżawa uzyskana. . . . . . . . : 6 stycznia 2012 15:06:02
   Dzierżawa wygasa. . . . . . . . . : 8 stycznia 2012 12:30:16
   Brama domyślna. . . . . . . . . . : 89.74.136.1
   Serwer DHCP . . . . . . . . . . . : 62.179.2.134
   Serwery DNS . . . . . . . . . . . : 62.179.1.62
                                       62.179.1.63
   NetBIOS przez Tcpip . . . . . . . : Włączony

Status when connected via modem:

Status

Best Answer

Have you shut down the modem and router and then restarted the modem and allow it to fully boot and then restart the router? Have see an issue whwrere modem is "bound " to the MAC of the computer at setup. Have seen this when changing routers as well. Have also seen cases in Canada where the ISP has to make a change to allow a different MAC. Sometimes waiting 24 hours without modem connected works if DHCP lease is short.

Have also seen D-Link modems that need to have the speed on the WAN port set manually. default is auto and some modems do not work well this way. On the D-link firmware I have it is on the Advanced tab and then Advanced Network. You can pick from 10Mbps, 100Mbps, 1000Mbps or Auto. Try each one and see what you get

Your router should also be able to Spoof the MAC of the computer and that may be needed if above does not work. There is a button on the Manual Internet setup page "Copy your PC's MAC Address" that makes this easy.

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