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in Linux Mint 17 I have to run sudo dhclient
every time I connect and disconnect to/from the Internet using a mobile broadband dongle, because otherwise the connection is declared active but when I try to open a web page my browsers freeze in the "resolving host" state (and the email client too).
I thought the problem was very similar to the one mentioned in this question, so I edited "/etc/network/interfaces" adding the last two lines:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
auto wwan0
iface wwan0 inet dhcp
then I also run sudo /etc/init.d/networking restart
but nothing changes (I rather get these messages: "Waiting for network configuration...", "Waiting up to 60 more seconds for network configuration...", "Booting system without full network configuration...").
How should I proceed? Thanks a lot.