Calculate directed broadcast address given IP address and subnet in PowerShell

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+2 Q:

Calculate directed broadcast address given IP address and subnet in PowerShell

My goal is to calculate the directed broadcast address when given the IP and subnet mask of a host node. I know, sounds like homework. Once I reasoned through my task and boiled it down to this, I was amused with myself. Anyway, the solution will look something like the one in this question I suppose, but I'm not a math major and my C sucks. I could do with a PowerShell (preferred) or C# example to get me going.

thanks!

+4 A:

See here for some PowerShell functions for IP math, including one that will calculate the broadcast address. The problem with using straight-up -bNot for the calculation is that it returns a signed int64, which kind of messes up any bitwise operations that are needing unsigned representation of the number.

James Kolpack 2010-05-03 20:35:21

Yes, noticed that already. Deleting. Also, to halr9000: You shouldn't use the `Address` property; it's marked obsolete in the documentation.

Joey 2010-05-03 21:26:23

Yes, the behavior of `-bNot` is kind of odd, considering that the bitwise not in C# evaluates to the same type as the operand.

James Kolpack 2010-05-03 22:43:57

Thanks for the note about Address. That's the sort of thing that's not obvious from within the console. :)

halr9000 2010-05-04 11:56:34

It is marked as obsolete. It isn't really hard to work with addresses if you spend some time looking at them in binary. My subnet calculator shows network, host, mask, directed broadcast, as string and binary. If you are interested it is here http://www.vbforums.com/showthread.php?p=3789524#post3789524

dbasnett 2010-05-06 17:32:34

ansaurus

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Calculate directed broadcast address given IP address and subnet in PowerShell

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