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ipv6gen(1)             DragonFly General Commands Manual            ipv6gen(1)

NAME
       ipv6gen - IPv6 prefix generator.

SYNOPSIS
       ipv6gen [ -d ] [ -lmr ] [ -s <num> ] <prefix> <prefix_length>

DESCRIPTION
       ipv6gen is tool which generates list of IPv6 prefixes of given prefix
       length from certain prefix according to RFC 3531.

OPTIONS
       -d     debug mode. Displays allocated prefix as bit array.

       -l     allocate bits from the left. e.g. for delta 4, the bit array
              looks like this:

              0000
              1000
              0100
              1100
              0010
              1010
              0110
              1110
              0001
              1001
              0101
              1101
              0011
              1011
              0111
              1111

       -r     allocate bits from the right. This is the same as allocation
              from the left but reversed. e.g. again for delta of value 4:

              0000
              0001
              0010
              0011
              0100
              0101
              0110
              0111
              1000
              1001
              1010
              1011
              1100
              1101
              1110
              1111

       -m     allocate bits from the middle. This method tries to allocate
              bits close to the axis of delta first and then proceeds to
              sides.  For delta of value 4 it is:

              0000
              0100
              0010
              0110
              1000
              1100
              1010
              1110
              0001
              0011
              0101
              0111
              1001
              1011
              1101
              1111

              For delta of value 5, it is:

              00000
              00100
              01000
              01100
              00010
              00110
              01010
              01110
              ...

              00001
              00011
              00101
              00111
              01001
              01011
              01101
              01111
              10001
              10011
              10101
              10111
              11001
              11011
              11101
              11111

       -s <num>
              set step between generated prefixes. It will leave out step-1
              prefixes between each two generated prefixes. default step value
              is 1.

EXAMPLES
       If we need to to split /48 prefix into two prefixes:

       worm[~/IPv6/ipv6gen]> ./ipv6gen.pl 2001:1508:1003::/48 49
       2001:1508:1003:0000::/49
       2001:1508:1003:8000::/49

       To allocate bits from the middle from /32 prefix with 4-bits wide
       delta:

       worm[~/IPv6/ipv6gen]> ./ipv6gen.pl -m 2001:1508::/32 36
       2001:1508:0000::/36
       2001:1508:4000::/36
       2001:1508:2000::/36
       2001:1508:6000::/36
       2001:1508:8000::/36
       2001:1508:C000::/36
       2001:1508:A000::/36
       2001:1508:E000::/36
       2001:1508:1000::/36
       2001:1508:3000::/36
       2001:1508:5000::/36
       2001:1508:7000::/36
       2001:1508:9000::/36
       2001:1508:B000::/36
       2001:1508:D000::/36
       2001:1508:F000::/36

AUTHOR
       Vladimir Kotal <vlada@devnull.cz>

WEBPAGE
       http://techie.devnull.cz/ipv6/ipv6gen

BUGS/TODO
       ipv6gen should be converted to Perl library/module.

                                                                    ipv6gen(1)