It appears that Comcast is using 6to4 tunnelling on all new installs in Washington and Oregon. I am trying to install CentOS 6 (latest), and nothing I do seems to work.
My method is as follows:
The Comcast modem is directly connected to the box. Insert the NetInstall disk and bootstrap.
Select the URL method of install, and enable both IPV4 and IPV6. I
know that if I enable IPV4 only, it fails.
Network manager never manages to initialize the network.