Time Capsule connection problem

My setup: Netgear DSL Modem with NAT enabled and wireless disabled. Time Capsule wireless network enabled and set in bridge mode. My wireless network is OK. I have one desktop that I connect with Ethernet. This desktop can access Time Capsule over Ethernet to modify settings, however, it has lost the ability to connect to Internet by Ethernet. It can connect wirelessly.

So, what happened to lose the Internet connection over Ethernet but not wireless?

Thanks so much
Ken