The OS/2 Firewall Feature

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IBM's 32-bit OS/2 TCP/IP stack (part of MPTS v5.3 and up) includes a powerful firewall. This feature is a partial port of AIX SecureWay Firewall. It supports packet filters and basic IPSec tunnels. In conjunction with TCP/IP v4.1 and up, it can also turn OS/2 into a dynamic client for AIX-based Virtual Private Networks. Unfortunately, the feature is largely undocumented and comes with no graphical configuration interface (besides the aforementioned AIX VPN client). To address this shortcoming, I have written some documentation on how to use the firewall feature. Download the documentation in INF (IBM Information Presentation Facility) format. Browse the documentation online. (This was converted to HTML from the INF document, so the formatting may not be particularly good.)