Neighbour Problem Manager

    cidr-deny-allow-transformer
    TypeScript icon, indicating that this package has built-in type declarations

    1.1.0 • Public • Published

    cidr-deny-allow-transformer

    This is a NPM library that allows you to transform a subset of denied CIDRs within a larger CIDR into a list of allowed CIDRs.

    Less talk, more library

    npm install cidr-deny-allow-transformer

    Keep track of the versions with the changelog.

    Motivation

    If you're deploying infrastructure-as-code to AWS, you come across SecurityGroups with their corresponding ingress configuration. SecurityGroups can only be configured to allow but not to deny certain traffic.

    In reality, you often want to deny certain CIDRs (e.g. those containing IPs of gateways that are exposed to the internet) while you want to allow the rest of a larger CIDR (e.g. you company network).

    With this small library you can do exactly that - pass a CIDR and a subset of denied CIDRs and you'll get all allowed CIDRs.

    I recommend using this library, if you're using the AWS-CDK and are dealing with SecurityGroups.

    Usage

    Import the transformer...

    import { CidrDenyAllowTransformer } from 'cidr-deny-allow-transformer';
    

    ... and find your allowed CIRDs:

    const allowedCidrs = CidrDenyAllowTransformer.findAllowedCidrs('192.160.0.0/12', '192.162.0.0/18', '192.172.0.0/23', '192.172.56.0/21');
    

    Install

    npm i cidr-deny-allow-transformer

    DownloadsWeekly Downloads

    1

    Version

    1.1.0

    License

    Apache-2.0

    Unpacked Size

    106 kB

    Total Files

    11

    Last publish

    Collaborators

    • obirah