Whilst completing my studies for the JNCIA-Junos exam I was trying various configuration on my SRX110 and decided to expose it to the internet as my LAN 'DMZ host', after a little while I noticed the log filling up with messages like these: Feb 14 11:24:24 2018 CS7-SRX01 sshd: SSHD_LOGIN_FAILED: Login failed for user 'root'... Continue Reading →
After a recent spate of hardware lock-ups and random reloads I decided to replace my ASA5505. It was the first cisco device I ever purchased and set me on my networking career, but it was playing up so I decided to swap it out for a Juniper SRX110H2-VA. As far as I can tell they... Continue Reading →
Woohoo, after 4 years of posting on CSC I received this email: Only to be told the following day that as I am a Cisco contractor I am not eligible. Maybe 2019?
This post on CSC caught my attention and reminded me of the challenges thrown up whilst working my first IT job at a charity. Typically trying to stitch together enterprise solutions for the bare minimum price. At time of writing to two replies to the post come in at $700 (C881W) and $670 (MX64W). The... Continue Reading →
This post came about after answering a question on CSC regarding tunnels and VRF, and will elaborate on the the use case I suggested. Imagine two sites with multiple VRFs which need to communicate intra-VRF over a public WAN, lets run through the configuration options: Option A Each VRF would require a public IP which... Continue Reading →
Python NX-API script for modifying switchport configuration.
The source file has grown by some 53 lines so what have we gained: A more colourful palette, the values of which are pre-computed for each possible iteration value: palette = new int[MAX_ITER]; for (int i = 0; i<palette.length; i++) palette[i] = java.awt.Color.HSBtoRGB(i/256f, 1, i/(i+8f)); The ability to zoom in and out of the set... Continue Reading →
Being a Java luddite who still defaults to Swing I thought it was time to learn something new. Here's a set of tutorials combing JavaFX with the GUI favourite the Mandelbrot fractal. I won't dwell on the function f(z)=z2 +C other than to say the JDK doesn't support Complex numbers, so the initial method looks... Continue Reading →
Upgrading Cisco SG-200 SG-300 SG-500 switches via CLI
How to configure an open SSID with MAC address filtering on the Cisco 3850.
