network settings

I‘m new to networking and need help with network settings. I’m looking for a tool for calculating available host address ranges with CIDR using Linux command prompt. How do I use subnet calculator under Linux or UNIX?

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I‘d like to set my Macbook as a router for my other desktop computer. How do I set NAT and port forwarding under MAC OS X? How do I forward ports using OS X for BitTorrent clients?

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How do I configuring TCP/IP and the network interface under AIX UNIX operating system?

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