February 10, 2016 by James

Troubleshooting High CPU usage on a Catalyst 6500 due to ARP Input.

Faced with a Cat 6500 with dual Sup 2T's that responded to a  show running-config with Unable to read Configuration.Try Again later and general cli slowness, it became aparrent that the CPU load on the supervisors was massive: cat-6500-sw1#sh proc cpu sorted CPU utilization for five seconds: 99%/83%; one minute: 99%; five minutes: 99% PID…

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May 16, 2013 by James

Raspberry PI as a wireless bridge..

I'm using a RPi with an Edimax usb wireless controller to bridge the home wireless network into a switch with some kit connected that I would rather not cable up to.   Once you've got the wireless set up (using the wpa_gui or any number of cli variants the rest is nice and easy – if…

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April 5, 2013 by James

A blast from the past is always amusing…

I do enjoy it when I find something I've written that makes me think 'cool!' when I read it again: This virtual name server node requires some out of the ordinary config to work, due to the way VMWare's switches behave. You'll need to set promiscous mode -> yes in the vDS portgroup config, ensure the…

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March 5, 2013 by James

(amusingly|scarily) accurate !