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ipv6gen(1)							    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)

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