Juniper SRX-110H EoL

Somehow I missed this when it was announced, but the Juniper SRX-110H-VA is End of Life, and is no longer supported for new software releases.

Wipebook - A Portable Whiteboard

It is a stereotype, but engineers really do like whiteboards. Problem is, you can’t carry one around with you. Plus there’s still a few unenlightened employers who don’t provide whiteboards....

iRules/Tcl - Watch the Comments

It’s pretty common practice to ‘comment out’ lines in scripts. The code stays in place, but doesn’t get executed. Perfect for testing, when you might need more debug output, or you want...

Complexity vs Security

Many of the ‘security’ measures in our networks add complexity. That may be an acceptable tradeoff, if we make a meaningful difference to security. But often it feels like we...

War Stories: Cursed VLANs

This article is Part 7 in a 12-Part Series. Part 1 - War Stories: Loops that Permanently Broke the Network Part 2 - War Stories: Switches Lying about Duplex Mismatches...

Ops Work vs Project Work

There’s a constant tension between delivering new services, and running the existing services well. How do you figure out how to prioritise work between Operations tasks and Project work? Skewing...

Meeting Rules

Years ago a wise engineer gave me these rules for meetings:

Cumulus in the Campus?

Recently I’ve been idly speculating about how campus networking could be shaken up, with different cost and management models. A few recent podcasts have inspired some thoughts on how Cumulus Networks might fit...

Accurate Dependency Mapping - One Day?

Recently I’ve been thinking about Root Cause Analysis (RCA), and how it’s not perfect, but there may be hope for the future.

Fixed-Price, or T&M?

Recently I posted about Rewarding Effort vs Results, how different contract structures can have different outcomes. This post covers Time & Materials vs Fixed-Price a little more, looking at pros & cons,...

Andrisoft Wanguard: Cost-Effective Network Visibility

Andrisoft Wansight and Wanguard are tools for network traffic monitoring, visibility, anomaly detection and response. I’ve used them, and think that they do a good job, for a reasonable price....

Non-Functional Requirements

I’m currently reading and enjoying “The Practice of Cloud System Administration.” It doesn’t go into great depth in any one area, but it covers a range of design patterns and implementation...