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Weaver

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  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
« on: January 27, 2018, 07:07:47 PM »
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burakkucat

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« Reply #1 on: January 27, 2018, 07:27:16 PM »
Quote from: Weaver on January 27, 2018, 07:07:47 PM
Next routines: a routine that take a CIDR /nbits integer value and comes back with an ipv4 or ipv6 netmask in ascii.

But I also need to do some pref-length masking arithmetic on ipv6 addresses, for example testing if an address is in the range of say some /nbits so given say 2001:db8:beef:cafe:cec1::/40 testing whether some other ip address is inside that range given by the netmask as applied to that prefix with the irrelevant low-order bits knocked out.

Would whatmask be of any use to you?
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:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

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Weaver

  • Senior Kitizen
  • ******
  • Posts: 11459
  • Retd s/w dev; A&A; 4x7km ADSL2 lines; Firebrick
« Reply #2 on: January 28, 2018, 02:26:56 AM »
thank you very much for that link!

The lack of a bitwise AND operation in Workflow means I have to write my own using who knows what nightmarish mountain of code. That is going to be fun. I may end up with using a technique that I've used before and precompute a lookup table of some sort to vastly speed up things.
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