Looking to provide customers with more secure remote access to corporate resources and possibly catapult it to the top echelon of SSL VPN vendors, Citrix Systems last week said it would buy SSL VPN vendor Net6.

The $50 million purchase should help the company attract new customers who are interested in remote access in general and in supporting IP voice and conferencing over the same infrastructure.

The deal ought to put the vendor among first-tier SSL VPN vendors such as Aventail, Juniper, Nortel and Cisco, says Robert Whiteley, an analyst with Forrester Research. "Net6 is a small start-up with a capable product. With Citrix's [well-known] name, it can be the big brother that gets Net6 into big accounts."

Citrix is best known for its MetaFrame software environment but has recast itself as a company that can connect voice or data traffic from any type of device - PC, handheld or wireless phone. Net6 products can help it along that road.

The Net6 Hybrid-VPN HVPN Gateway is an appliance that sits between corporate networks and the Internet, terminating SSL sessions with remote machines and proxying to servers behind corporate firewalls. In this it is like other SSL VPN gear. Unlike other SSL VPN gear, it intercepts traffic at Layer 2 and tunnels it over SSL, giving the remote user full access to client-server applications. This means that as applications and protocols are updated and changed, HVPN can handle them without requiring upgrades to HVPN itself, Net6 says.

The box also can perform remote control, letting remote users take control of their desktop PC back at corporate headquarters from a laptop in a hotel room, for example. It supports collaboration by letting users invite other users logged on to the same HVPN machine to work simultaneously on the same document. The company also plans to link IP voice sessions, letting HVPN act as a voice-conferencing platform or a form of PBX to switch phone calls among corporate users. Citrix says it will sell the Net6 products separately at first and work on integration over time.

Citrix already has an SSL VPN product, MetaFrame Secure Access Manager (MSAM), but it was designed for large corporations that are heavy MetaFrame users, says John Girard, vice president of Gartner. By adding an SSL VPN appliance that midsize and small companies can afford and manage, Citrix can more readily attract users outside its current customer set, Girard says.