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My router's IP address is 192.168.1.245. I tried to access it but without success, because my WIFI address is 10.0.1.10 and my Ethernet address (via the Thunderbolt port) is 169.254.xxx.xxx.

How can I configure my router without having internal IP addresses?

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How do you know your router's IP address if you can't connect to it? –  patrix Jul 10 '12 at 12:17
    
Because I once configured it so on a Windows PC. –  doonot Jul 10 '12 at 12:18
    
Where does your Mac get the IP address from? If the router acts as a DNS server the Mac should pick up a "proper" address automatically. –  patrix Jul 10 '12 at 12:20
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1 Answer

Settings - Network - Thunderbold Ethernet - Configure IPv4: Manually: 192.168.1.20. After this I am able to access the router.

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Alternatively, you could have changed the service order to place the Wi-Fi connection (which looks like it would have worked) above the self-assigned address. This sort of thing usually is a temporary issue unless your router has access controls based on MAC addresses which would explain why it wouldn't issue an IP address to a new network endpoint. –  bmike Jul 10 '12 at 13:05
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