11 posts tagged with "Scripting"

Yesterday I saw a post, now removed, on Reddit that revealed that ESET uses DNS queries to do MAC address OUI lookups. This is quite smart because it allows a client to avoid maintaining a local copy of the OUI database and also means that the databases can be queried without having to have direct or proxied http access to an external API endpoint.

While rage coding a python MCP server for NetBox I realised I needed a better way to test it. You can use CURL to make requests of course but it turns out that there is a handy node.js package that provides comprehensive test capabilities for MCP servers.

Netbox open sourced their STDIO MCP server a while back and I have been playing around with it since then. The installation requires some local dependencies and the setup process was a bit tricky, but I managed to get it up and running with some trial and error. I found it substantially harder to set up and wouldn't necessarily trust that the sort of people who would benefit from having access to it would be able to easily set it up so I wanted to create a more user-friendly installation process by building an MCP server that runs remotely as a proxy to the Netbox API.

I've had some concerns around Model Context Protocol being a new fad to put another front end on poorly managed data, like the search appliances Google sold a decade and a half ago, but I had a play with the MCP server for Netbox and it's pretty handy.

This is here primarily as a reminder to me; a note for when I need this again. You may already know this or you may find this useful to learn this.

Introduction: Beyond the Basics​

FizzBuzz has long been a staple of programming interviews. The problem is deceptively simple: print numbers from 1 to n, but replace multiples of 3 with "Fizz", multiples of 5 with "Buzz", and multiples of both with "FizzBuzz". It's not meant to be a challenging algorithmic puzzle; most candidates with basic programming knowledge should solve it without difficulty.

So why does this trivial problem persist in the interview landscape? Because I believe FizzBuzz's true value isn't in filtering out candidates who can't code; it's in opening discussions about complexity, language characteristics, optimisation, and the subtle costs of different operations. The best interviewers don't just ask candidates to solve FizzBuzz; they use it as a starting point for a deeper technical conversation.

A little while ago I set out to find a way to measure the overhead that FQDN filtering places on HTTPS web traffic. I've shared the results here, but I thought I'd take the opportunity to discuss the methodology in a bit more detail.

I've put together a summary of some common search algorithms and how they work. This post covers key search algorithms used in computer science, explaining their approaches, strengths, weaknesses, and showing Python implementation examples.

I was chatting with a friend who's studying for his AZ-700 exam, and he showed me this rather neat way of finding your IP address using Google DNS.

I'm working on a DHCP migration and discovered the previous admins didn't clean up old scopes when sites closed. It's hard to identify dead scopes from lease numbers since some live sites are rarely used. So I've created a simple script to ping the default gateway to check if the subnet still exists.

There used to be a great little website for route summarisation and it did it far more intelligently than Cisco kit does it. It looks like the site has dropped off the internet which is a shame but there is a handy python library called netaddr with has the same capabilities.

I have written a little wrapper for it which will regex the prefixes out of a ‘show ip bgp’ and then list the summary routes. You pass the output of ‘show ip bgp’ as a text file, it’s the only argument the script expects.