I just grabbed CentOS 6.2 (don’t know if it’s an issue in 6.0, 6.1), but an installation with the “Basic Server” within VMware Fusion 4.1.1 delivered no IP address etc. when leaving DHCP/NAT as the default.
Finding: Seems, either something is goofed in the dhclient or NetworkManager (now default for RHEL 6.x).
Fix: I brought the network interface up “ifup eth0″, then ran “dhclient eth0″, obtained an IP and ran “yum update -y”, after which (I noticed dhclient was in the updates), I was able to reboot and all worked well.
Not a big deal, as you could have just manually configured your network script, but maybe it will help someone.