Does anyone know of a tool/script that can aggregate subnets feed to it
via command line? Meaning if I give it multiple /30s (or any size
subnet) it will scrunch them together.
Example:
#aggregate_subnets.script 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29
10.0.0.24/29
#192.168.0.0/29 10.0.0.16/28
Thanks.
Ric Moseley
VP of Engineering
rmoseley@softlayer.com
214-442-0555 direct
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866-398-7638 toll-free
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netmask:
netmask 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29
10.0.0.16/29
192.168.0.0/29
Certainly available in the ubuntu repositories.
Does anyone know of a tool/script that can aggregate subnets feed to it
via command line? Meaning if I give it multiple /30s (or any size
subnet) it will scrunch them together.
I wrote this years ago and we used it in 6461 for various things.
ftp://ftp.isc.org/isc/aggregate/aggregate-1.6.tar.gz
Example:
#aggregate_subnets.script 192.168.0.0/30 192.168.0.4/30 10.0.0.16/29
10.0.0.24/29
#192.168.0.0/29 10.0.0.16/28
[octopus:~]% cat >input-file
192.168.0.0/30
192.168.0.4/30
10.0.0.16/29
10.0.0.24/29
[octopus:~]%
[octopus:~]% aggregate <input-file >output-file
aggregate: maximum prefix length permitted will be 32
[octopus:~]% cat output-file
10.0.0.16/28
192.168.0.0/29
[octopus:~]%
It's quite bad at dealing with really long lists, but it's ok for small applications. There's a manual page, and options, and stuff. You can make it show its working, if you're worried about whether it is sane.
[octopus:~]% aggregate -v <input-file
aggregate: maximum prefix length permitted will be 32
[ 0] + 10.0.0.16/28
[ 0] + 192.168.0.0/29
[ 1] - 192.168.0.0/30
[ 2] - 192.168.0.4/30
[octopus:~]%
I forget exactly what the numbers in the brackets mean, but from memory 0 means it's a generated prefix and anything else refers to a line number in the input stream. No doubt the source would provide illumination.
I don't remember why I thought it was a good idea to spit out the "maximum prefix length" warning to stderr every time.
Joe
Ric Moseley wrote:
Does anyone know of a tool/script that can aggregate subnets feed to it
via command line? Meaning if I give it multiple /30s (or any size
subnet) it will scrunch them together.
Here is a Perl script to do just that. My normal one reads from STDIN.
#!/usr/bin/perl
use Net::CIDR::Lite;
my $cidr = Net::CIDR::Lite->new ();
foreach (@ARGV) {
if (/^[0-9a-f\.:]+(\/\d+)?$/) {
$cidr->add_any ($_);
}
}
print (join ("\n", $cidr->list ()));