DHCP Is Working
Your machine is still called "localhost". You can also access it by the localhost IP address, which is the loopback address 127.0.0.1.
DHCP is assigning a hostname to the machine as it is connected to the internet. Great thing about the name is you should be able to ping your machine from anywhere using its name, even if your actual IP address is dynamic.
Is interdigital your ISP? If it isn't, then I'd be worried.