Nokia has introduced a security appliance aimed at helping enterprises keep their networks secure, particularly in the face of mobile data access by employees using smartphones and laptops.

The appliance, announced on Wednesday, combines Nokia's existing security platform with Sourcefire, the intrusion prevention software based on open-source Snort software.

The product uses three methods for blocking threats. Sourcefire Intrusion Sensor for Nokia uses the Snort detection engine to inspect incoming traffic for problems, generate alerts and block traffic. The software examines packets using signature, protocol and anomaly-based inspection methods.

The appliance also uses Sourcefire Real-Time Network Awareness for Nokia to do intelligent network monitoring. Information gathered by the monitoring software can be used to remediate an attack.

The third component, Sourcefire Defence Centre for Nokia, allows administrators to identify long-term security trends and offers a centralised location for managing sensor policies, correlating intrusion events and configuring alert responses.

Pricing for Nokia Intrusion Prevention with Sourcefire starts at $14,995 and is available as part of Nokia's IP390 security platform.

Other security products form Nokia include firewalls, IP VPN (virtual private network) and SSL (Secure Sockets Layer) VPN products.

Earlier this year, Nokia announced that it would integrate Sourcefire's software into its line of network security appliances by the end of the year.