Finnish security vendor F-Secure has acquired network monitoring appliance vendor ROMmon. The deal will give F-Secure a new device to add to its line of security products for ISPs.

ROMmon's product has been renamed F-Secure Network Control Appliance, and will eventually be integrated into new security products for ISPs, said Mikko Hypponen, director of anti-virus research with F-Secure.

"The strength of the device is that it's really capable of operating at high speeds, so this is something that ISPs can use regardless of how many customers they have," he said.

ISPs could configure the Control Appliance to discover and block infected PCs on their network and then automatically direct them to websites of security vendors or to download software patches. This technique could be used, for example, to repair a "bot-infected" computer that had been taken over by malicious software and was being used to send spam, Hypponen said. "The fact that we can do real-time monitoring of an ultra-fast network will enable us to do automatic blocking of botnets, and things like that," he said.

Based in Espoo, Finland, ROMmon was formed in 2001 by networking expert Petri Helenius. The company has a staff of four. Terms of the F-Secure acquisition were not disclosed.