One of my relatives recently lost IPv4 but not IPv6 connectivity through Comcast. She actually e-mailed me that her Internet was down. Of course GMail was the o

One of my relatives recently lost IPv4 but not IPv6 connectivity through Comcast. She actually e-mailed me that her Internet was down. Of course GMail was the only site she used that supports IPv6, everything else was timing out. After power-cycling all the usual suspects it took a call to Comcast that actually needed escalation to get resolved.