networking a Cisco (Comcast Business) DPC3939B Gateway to Cisco 2821 router

[dvaniwaarden]

I have configured the 2821 to be the DHCP server correctly and have it routing through a small switch to 2 different laptops connected to the switch and assigning IP addresses.   I have the primary and  secondary DNS servers set to 75.75.76.76 and 75.75.75.75 respectively.  The issue is that I can't seem to get internet access to the laptops coming down through the 2821.  I have gone through as many Cisco guides as I can find and don't see anything that has helped me.  I know that it should be some sort of configuration setting but I can't find it.  I'm new to this so a detailed description would be much appreciated.  Thanks for responding.

[mcselltor]

Hello,

it would be easier if you post the configuration, I think. Following your description, I would say a NAT-config is missing.

http://www.cisco.com/c/en/us/support/docs/ip/network-address-translation-nat/13772-12.html

Torsten

[dvaniwaarden]

Thank you for your response.  I will try to post my configuration.  I thought that it might be the NAT-config.