CIDR -> IP Linking

[dylanratcliffe]

From a conversation between @dylanratcliffe & @DavidS-om

Many things (like security groups) will have a CIDR that they are related to. It would be very cool if Overmind could actually link these things. I.e if you were to create a security group that referenced 10.0.2.4/24, you could somehow actually get linked item requests to everything that used an IP within that range.

[DavidS-ovm]

One cheapo approach could be to always link to the next-shorter multiple-of-eight prefix, e.g.:

• ip:10.2.3.4 -> 10.2.3.0/24 -> 10.2.0.0/16 -> 10.0.0.0/8
• security group rule A: "deny 10.2.3.0/25" -> 10.2.3.0/24 -> 10.2.0.0/16 -> 10.0.0.0/8
• security group rule B: "deny 10.2.3.128/25" -> 10.2.3.0/24 -> 10.2.0.0/16 -> 10.0.0.0/8

All three items get linked through 10.2.3.0/24, but security group rule B would not actually be directly relevant to the IP. It still might be helpful to see "adjacent" items, but it might also be additional overhead to evaluate relevance manually.