No Networking after upgrade from FreeBSD 9 to FreeBSD 10

When upgrading from FreeBSD 9 to FreeBSD 10 the interface names are changed due to the installation of Xen drivers which will cause networking connectivity issues.

In FreeBSD 9 major versions, you can see the interface names located in the configuration file /etc/rc.conf.

They are labeled em0 and em1.

After the upgrade to FreeBSD 10 major version, you will need to go into the configuration file /etc/rc.conf and change these interface names.

em0 should be changed to xn0.

em1 should be changed to xn1.

With this change networking will become operational again.

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