Here's another one that I don't really understand. After working fine all last week with use all day every day, my virtualbox VM running on centos 7 guest and windows 10 host would not connect to the network. I rebooted my entire network, the guest and the host, but the problem remained. I easily found a solution with a google search, but I'm not entirely sure why it's necessary or why things worked fine last week without it.
Here is the thread containing the fix, and in the end I just added the following lines to the guest file /etc/sysconfig/network-scripts/ifcfg-enp0s3:
DNS1=8.8.8.8
DNS2=8.8.4.4
# Note this was set to no
ONBOOT=yes
I restarted the guest VM, and then everything works fine.
The two DNS entries are for the Google Public DNS system. I don't know why I didn't need them last week, or why ONBOOT (which was previously set to no wasn't a problem either...
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