It's Never The Network
A place to plan, troubleshoot and learn about computer networks and other cutting edge infrastructure technologies.
This list is constantly growing, so be sure to check back.
By Brandon James on 2019-12-31
Filed Under: Route/Switch, Automation, Programming
Managing access lists is one of the more painful parts of being a network engineer. Once you've finishing working out what should or should not be allowed, you write the ACL and then paste it into all your devices. The minute you finish, the requirements change or the business lets you know what you just broke. In the future, SGTs and SDN promise to fix this problem, but you might not be there yet. `mod_acl` is a simple and fast way to manage ACLs.
By Brandon James on 2019-12-06
Filed Under: Route/Switch, Programming
RFC 7761 describes a hash function used to load balance multicast groups between Rendezvous Point (RP) candidates when you are using Bootstrap Router (BSR). The hash function isn't straight forward and I was unable to find a resource that described it in detail. One feature of the hash function is an adjustable hash mask length. I think it's important to understand what the function does and how adjusting the mask impacts RP selection. I do my best to describe it here and provide some resources to help you select the best hash mask length for your environment.
By Brandon James on 2019-11-23
Filed Under: unfiled
A month ago I decided to submit NTN to Cisco's IT Blog Awards in the Best Newcomer Category. To my surprise it got selected as a finalist. Since I don't have an about page, I wanted to briefly write about who I am, what NTN is and my plans for the future of NTN.
By Brandon James on 2019-10-10
Filed Under: Cheatsheets, Linux
At first, I was using Linux because I'm a nerd and that's what we do, but I continue to use it because it increase my productivity.