1ipv6gen(1)                  General Commands Manual                 ipv6gen(1)
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NAME

6       ipv6gen - IPv6 prefix generator.
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SYNOPSIS

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

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

16       -d     debug mode. Displays allocated prefix as bit array.
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18       -l     allocate bits from the left. e.g. for delta  4,  the  bit  array
19              looks like this:
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21              0000
22              1000
23              0100
24              1100
25              0010
26              1010
27              0110
28              1110
29              0001
30              1001
31              0101
32              1101
33              0011
34              1011
35              0111
36              1111
37
38       -r     allocate  bits  from  the  right. This is the same as allocation
39              from the left but reversed. e.g. again for delta of value 4:
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41              0000
42              0001
43              0010
44              0011
45              0100
46              0101
47              0110
48              0111
49              1000
50              1001
51              1010
52              1011
53              1100
54              1101
55              1110
56              1111
57
58       -m     allocate bits from the middle. This  method  tries  to  allocate
59              bits  close  to  the  axis  of  delta first and then proceeds to
60              sides.  For delta of value 4 it is:
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62              0000
63              0100
64              0010
65              0110
66              1000
67              1100
68              1010
69              1110
70              0001
71              0011
72              0101
73              0111
74              1001
75              1011
76              1101
77              1111
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79              For delta of value 5, it is:
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81              00000
82              00100
83              01000
84              01100
85              00010
86              00110
87              01010
88              01110
89              ...
90
91              00001
92              00011
93              00101
94              00111
95              01001
96              01011
97              01101
98              01111
99              10001
100              10011
101              10101
102              10111
103              11001
104              11011
105              11101
106              11111
107
108       -s <num>
109              set step between generated prefixes. It will  leave  out  step-1
110              prefixes between each two generated prefixes. default step value
111              is 1.
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EXAMPLES

114       If we need to to split /48 prefix into two prefixes:
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116       worm[~/IPv6/ipv6gen]> ./ipv6gen.pl 2001:1508:1003::/48 49
117       2001:1508:1003:0000::/49
118       2001:1508:1003:8000::/49
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120       To allocate bits from the middle  from  /32  prefix  with  4-bits  wide
121       delta:
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123       worm[~/IPv6/ipv6gen]> ./ipv6gen.pl -m 2001:1508::/32 36
124       2001:1508:0000::/36
125       2001:1508:4000::/36
126       2001:1508:2000::/36
127       2001:1508:6000::/36
128       2001:1508:8000::/36
129       2001:1508:C000::/36
130       2001:1508:A000::/36
131       2001:1508:E000::/36
132       2001:1508:1000::/36
133       2001:1508:3000::/36
134       2001:1508:5000::/36
135       2001:1508:7000::/36
136       2001:1508:9000::/36
137       2001:1508:B000::/36
138       2001:1508:D000::/36
139       2001:1508:F000::/36
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AUTHOR

142       Vladimir Kotal <vlada@devnull.cz>
143

WEBPAGE

145       http://techie.devnull.cz/ipv6/ipv6gen
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BUGS/TODO

148       ipv6gen should be converted to Perl library/module.
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