Dec 02

New page – converting PWM hubs to voltage controlled

New guide up – right here.

My Xen servers main board didn’t have a second PWM controlled fan header to use with a PWM fan hub for the 3 case fans. Its a 4RU case – which has server grade 140mm fans that can draw up to 0.9A each and get up to around 3600 RPM.

So here’s how I used an ATTiny85 to generate a PWM signal from the variable ‘Speed Control’ voltage on pin 2 of the SYS_FAN header.

Jul 29

Enabling BBR Congestion-Based Congestion Control on kernel-xen

With the release of kernel-xen version 4.9.40, I have enabled CONFIG_TCP_CONG_BBR. This adds support for using BBR to improve the throughput from your servers (mostly web servers) to your clients.

If you run my kernel-xen package on your Xen guests, you can also take advantage of this new feature.

To enable, ensure you are running kernel-xen version 4.9.40 or above, then create a file called /etc/sysctl.d/enable-bbr.conf containing:

net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr

You can activate this by typing: $ sysctl -p

The changes will automatically apply at the next system boot.

To read more about BBR and why it makes such a difference, head on over to acmqueue for a far more in-depth analysis than I could provide.

Jul 12

Turnbull handballs encryption problem to tech companies

In a speech in London overnight, Turnbull said companies should not be able to build end-to-end encryption tools that meant nobody – including courts and law enforcement – could access the content of communications.

If you’re in the tech industry, and you know your local Liberal party member, point them to this and tell them to go fuck themselves. Regards, The Internet.

If you don’t know who your local member is, search here:
http://www.aph.gov.au/Senators_and_Members/Members

Jun 21

Talkback on the NBN in 2017

Recently on The Conversation Hour with Jon Faine, they discussed the NBN, its progress, and if its living up to what was promised.

53 minutes of audio included below for your listening pleasure.

Mar 19

Staying safe online – is it even possible?

So every once in a while, you come across something in IT Security that just makes you want to cry.

Usually, these are chained exploits that when executed properly have devastating effects.

Take the latest Pwn2Own competition. One of the successful hacks there was epic. And scary.

In a nutshell, an ‘Edge’ browser exploit to get into the Windows 10 VMWare guest, then a bug in the VMWare guest to own the VMWare host. Yes, hacking the VMWare host – from a web page.

That’s scary.

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