Wednesday, 4 October 2017

Friday, 14 July 2017

Cisco Nexus NX-OS command shortcuts and scripting

Over your time with a Cli you get to know the shortcuts and useful but lightly published commands and shortcuts to proficient and fast access to info you need when trouble shooting.  The following link to firewall.cx is a greate article bring a wide ranging subset of these most useful commands all tougher in one place.

NEXUS NX-OS: USEFUL COMMANDS, CLI SCRIPTING, HINTS & TIPS, PYTHON SCRIPTING AND MORE

Thursday, 6 July 2017

Team "Chaos" day


My team took part in a couple of Chaos days in getting ready to support the first fully in house production work load on AWS.  This has resulted in our partner Cloud Reach putting out a blog on the experience of facilitation of the chaos! This also resulted in some further press articles below.

CloudReach Blog

http://diginomica.com/2017/07/06/met-office-chaos-welcome-new-cloud/

http://www.cloudpro.co.uk/hr/training/6904/met-office-asks-cloudreach-to-purposefully-break-its-systems


Sunday, 4 December 2016

New GCHQ CyberChef Open Source tool has some useful networking elements.

Just played with the new CyberChef tool GCHQ has put up on GitHub, Just had a quick play with the "Parse IPv6 address" & "Change IP Format" functions also useful for embedding IPv4 into IPv6 and checking IPv6 addressing among other things!

It runs in Chrome or Firefox, give it a go! CyberChef - The Cyber Swiss Army Knife

Troubleshooting BGP Neighbor Establishment

This is the most through explanation and has a really logical flowchart for troubleshooting, BGP neighbour issues that I have found, hope its helpful to you also.

Why Do BGP Neighbors Toggle Between Idle, Connect, and Active States?

Troubleshooting BGP Flow Charts

Thursday, 20 October 2016

Simulating Emulating WAN Latency in Linux - Linux Advanced Routing & Traffic Control

Needing to simulate delay to test an application ability to fill a pipe in the prototype lab, I needed to emulate the latency to get a more realistic view.  The blog post from Benjamin Cane (tc: Adding simulated network latency to your Linux server) got me onto this method.  I also found tc man page & ArchLinux Advanced Traffic Control Wiki useful for a deeper dive.
Also see my previous post on Toxiproxy - WAN simulator of sorts!