Altor Networks

About Altor Networks

Altor Networks, established in 2007, positioned itself as a key player in the nascent field of virtualization security for data centers and cloud environments. The company was founded by seasoned professionals from leading technology firms like Check Point Software, Cisco, and Oracle, with Amir Ben-Efraim serving as the CEO and co-founder. Ben-Efraim, whose father was also an entrepreneur, brought a blend of technical and business acumen to the venture, holding degrees in electrical engineering from UC Berkeley and Stanford, alongside an MBA from UCLA. His prior experience at Check Point during the rise of the commercial firewall provided him with critical insights into market needs, which directly influenced Altor's direction.

The company's core business was developing security solutions specifically for virtualized infrastructures. Altor identified a critical security gap early on: the lack of visibility and control over traffic moving between virtual machines (VMs) within a single physical server, often referred to as "east-west" traffic. To address this, Altor developed the industry's first purpose-built firewall for virtual networks. This software-based appliance could be installed within a virtualized environment to enforce granular, policy-based security on a per-VM basis, a significant departure from traditional hardware-based firewalls that were blind to this inter-VM communication. The security policies remained attached to individual VMs even as they moved across the data center. The product suite evolved to include an integrated intrusion detection system (IDS), VM introspection for compliance assessment, and comprehensive network monitoring.

Altor's business model focused on selling these virtual security appliances to enterprises and service providers managing large-scale virtual environments. The company gained traction by securing clients such as federal agencies and major corporations. Its progress was backed by venture capital firms, including Accel Partners and Foundation Capital, raising a total of approximately $17.5 million over several funding rounds. Juniper Networks, recognizing the strategic importance of virtual security, participated in a 2010 funding round before ultimately acquiring Altor Networks in December 2010 for approximately $95 million. The acquisition allowed Juniper to integrate Altor's technology into its own security architecture, extending its capabilities from physical to virtual systems and strengthening its position in the data center and cloud security markets.