Having problems to do remote viewing through home to office.

My iDVR- E series is connected via ethernet to a 2wire modem/router combo.

I have finish configuring the ip addresses for the idvr.

I am unsure of the fields of the gateway and the dns fields in order to access it over WAN.

Are the default gateway and the dns fields the same? i look at the Ipconfig and the entry are the same for a local pc.

How i can view the cameras through remote viewing for example from my home to my office< as the Idvr is located at the office?

Is the EMS software able to see the views from my home to my office?

Please help me or i have the wrong concept?

Thanks.