I have a really strange issue since i updated to Yosemite.
When i wake up my 2012 Mac Pro, the network connection is totally lost.

Output from dmesg (sorry, couldn't copy/paste at this time):

```
- Nic en0 - no link detected
- Nic en0 - link detected
- some other things (approx. 2 sec)
- Nic en0 - no link detected

```

Disabling/removing and adding/re-enabling in System Preferences didn't solve the issue. Only rebooting the whole machine will help. Interesting: If i remove the cable from en0 and put it in en1 (Mac Pro has two NICs), everything is fine - until next sleep/wakeup. After the next wakeup en1 is also not working. Only thing which helps is rebooting.

Tried also resetting the SMC - didn't solve it.