What is IPSO? The OS that runs on the Nokia IP Security Platform is called IPSO. IPSO, which originally stood for IP Switching Operating system, began its life at a company called
Ipsilon Networks. Nokia acquired Ipsilon in 1998 and now uses this OS in it IP Security products.
It is true that IPSO is based on FreeBSD, but it is now very different from FreeBSD in every respect important to running FireWall-1. There are several APIs that Nokia has added to IPSO specifically for FireWall-1. These APIs are either not present or significantly different in FreeBSD.
Nokia also has a IPSO based on Linux called IPSO-SX. This OS is used in the
Nokia Message Protector product.
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PhoneBoy - 30 Dec 2003
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What is IPSO? 
2005-08-13 
What is IPSO? 
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