Talari Networks, a San Jose maker of WAN virtualisation/aggregation appliances and software, added $15 million to its coffers via a new round of venture financing.

Its Series D funding is led by new investor Four Rivers Group, with existing investors Menlo Ventures and Silver Creek Ventures also participating. The funds will be used to pay off bridge loans and expand the company's product line and distribution network. Overall, the company has collected more than $37 million in venture funding.

Talari was founded in 2007 by a pair of Applied Micro colleagues and made its latest product splash in May at Interop with the Adaptive Private Networking 3.0 software, which enables customers to aggregate various WAN links to provide a more resilient and flexible network.

Talari competes with companies such as Mushroom Networks, RADware and FatPipe.