This is a new naming convention for network interfaces, and it is derived from:
Lan-On-Motherboard interfaces: em<port number> (ethernet-on-motherboard <1,2 ..>)
PCI add-in interfaces: p<slot number>p<port number>_<virtual function instance>
There is a way to revert back to ethX if you like: Dell has a whitepapaer on it here: http://linux.dell.com/files/whitepap...inux-v0.92.pdf
As for why you cannot browse the internet, you need to make sure the interface has a gateway.