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:

-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:

-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:

For delta of value 5, it is:

-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.