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Yes, but more than 1 line does not mean more than 1 NIC. Example $ lspci | grep -i net 01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5716 01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5716 This is 1 NIC connected to eth0:0 and eth0:1 (so 2 IP adresses) that is a PCI device(!). There is a better command: ...


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lspci list alll PCI devices so if you have some old built in network card, or some usb cards it will not shown in the result, so to get more precise result try this: ifconfig -a | grep Ethernet Thanks for @gertvdijk note add the -a option to ifconfig to list all interfaces even if they are down


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After searching on a lot of sites and blogs, apparently using an open DNS such as 8.8.8.8 or 8.8.4.4 rather than using automatic DNS solved the problem. I still don't know why the automatic DNS for the router is not working for Ubuntu although it is working fine for Windows.



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