But he is certain that the banks don't need help from the government with DDoS attacks. "Google and Amazon don't need the government to help them with DDoS. That's ridiculous," he said.

Paul DeSouza of the Cyber Security Forum Initiative said the private sector and government have different roles to play. "The private sector should be responsible for deploying the necessary technologies and controls to include trained personnel to be able to continue to operate through and in cyberspace in the protection of their assets even under attack," he said.

"The role of the government should be of a supporting nature to include cyber intelligence and knowledge sharing capabilities," he said. "Offensive cyber responses are reserved to governmental actors with the appropriate authorities to engage in full spectrum cyber operations."

But Jody Westby, an attorney and CEO of Global Cyber Risk, said the problem is not so much coordination between the private and public sector in the U.S., but internationally.

"Cybercriminals today have effectively analyzed what jurisdictions lack skilled law enforcement, where cooperation is lacking or nil, and where cybercrime laws are either non-existent or civil penalties," she said.