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I have an ubuntu up to date with wired Internet connection, but if I enter the Network Connections at the Wired tab it says that I have eth1 and eth0, and they're never used.

The system connects automatically to the Internet after booting, but if it disconnects for some reason I can not reconnect, only if I reset it in the terminal all over again (sudo pppoeconf)

Is there a quick reconnecting method?

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You could try (in a terminal): sudo dhclient

If your router's acting up, it might be faster

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