Subnetting and CIDR, a Pain in the Ass Worth Knowing

When it comes to networking, CIDR and subnetting are not something I’m particularly good or fast at because I haven’t bothered to memorize the most popular subnets – things like /22, 255.255.248.0 and blah. I was taught to work it out in binary, which is a pain in the ass, but correct. So because I […]

April 2017 Browser Tab Round-Up

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On Exachk, ICMP Validations, and Updates via Proxy

Oracle Exadata’s Exachk script has a validation which prevents it from auto-updating if your system does not have direct ICMP access to updates.oracle.com. This is stupid, as most Exadata machines are not going to have that kind of exposure to the Internet at large. Yes, they will be firewalled, and so, no, ping will not […]

On Successful Deployment of Access Management Solutions

I have seen many access control/identity/privilege management projects fail miserably because of an unstructured approach to implementation by Corporate Governance. A tool is bought and implementation attempted with no engagement with or buy-in from the technical people who will have to surmount the inconveniences of the tool when it misbehaves at 3AM on a Sunday […]

On Log Files and Output Files

If your script generates saved readable output, the target file is known as a log file and should be named with a “.log” suffix. If you run a script interactively and want to temporarily capture the output that is sent to the terminal, use a “.out” suffix (if you like). But please, for the love […]

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