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My Wlan-Card is named as 'eth1'. Last week it was wlan0 and now it turned to eth. I don't know why and don't know how to change this. How can I change this back?

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did you recently upgrade your ubuntu version to 12.04 or newer? – ImaginaryRobots Jul 31 '12 at 18:31
m facing the same problem after upgrading to – Nirmik Jul 31 '12 at 18:49
Do you need to change it back to eth0? It should work correctly as eth1 too. – Rafał Cieślak Jul 31 '12 at 19:07
what manufacturer of wireless card is it? – jackweirdy Jul 31 '12 at 20:55
No I haven't upgraded my ubuntu. It is the same state as the installation. And I want to change it back to wlan0. It is a Broadcom Card in an Acer laptop and named Acer Nplify (TM) 802.11 b/g/n – Marvin Püthe Aug 2 '12 at 17:42

The names are determined by the udev rules in the file /etc/udev/rules.d/70-persistent-net.rules. You can change the name there.

I don't know why that file changed on your computer, though.

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This is probably the following bug:

However, I suspect that was changed intentionally by the ubuntu maintainers for consistency.

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