DB Networks, a Carlsbad provider of cyber security for computer networks, said it obtained $17 million in new financing led by Grotech Ventures of Vienna, Va.

The round also included funding from investors Khosla Ventures and Citi Ventures.

The company also said Joe Zell, general partner of Grotech Ventures, has joined the company’s board of directors.

DB Networks said its customers include the world’s largest financial institutions, health care providers, manufacturers, government agencies and the military.