#125 Maximum depth for root subnets

[David Taylor]

It would be good to be able to set the maximum mask length for root subnets, as it is when creating new subnets in a big system the drop down list for root subnet can be massive. In my environment the largest "root" prefix is a /24 anything below that is a customer allocation.

[Miha Petkovsek]

Hi David, I get what you mean, but the point would be that anyone creates subnets as desired, so if /29 for root is desired than ok :)

If it bothers you as admin that users can create such subnets there is a easy fix for that. Edit site/admin/manageSubnetEditResult.php and add below lines after CheckReferrer();

if($_POST['masterSubnetId']==0 && str_replace("/","",strstr($_POST['subnet'], "/"))<24 ) {
die('Subnet mask must be at least /24!');
}

Or you can limit permissions on section that only admins can create new root subnets and you can prepare in advance.

Will think about adding it to next release.

brm

[Anonymous]

I understand, however in practice, subnets are generally allocated in blocks for either a given purpose eg loopbacks or to a given location. As it is the workflow for creating a large number of subnets becomes very cumbersome with a large number of subnets in play, by limiting the mask length only the functional blocks can be shown as "root subnets" making the process a lot easier.