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I have a linksys WRT1900 flashed to DD-WRT 3.0-r30796 and I am trying to connect it to a comcast modem/router to act as a DHCP for LAN. When using DHCP for WAN I am assigned an address (10.0.0.2) from the gateway at 10.0.0.1 (I cannot disable DHCP for the comcast modem/router). The dd-wrt router is hosting DHCP from 10.0.10.1 but there is no internet. I am not able to ping google.com. I have my dd-wrt in router mode.
I have set 10.0.0.1 as the gateway, and 75.75.75.75 as the DNS. What have I misconfigured that is preventing me from reaching the internet? From the comcast router page I can see the dd-wrt router connected.