Janusz Gumkowski — home page

Who? Where?

System and network administrator,
Poland, Europe.

What?
Variety of things.

What for?
For fun. For living.

How to contact me?
My private e–mail address can be found here.
I'll try to respond within a couple of weeks.

Shall you need to contact me urgently, here is my mobile phone number: .11 999 4596 84+

Recent changes:

(October 12, 2010): VADIS installation: update for Windows 7.

(January 24, 2010): Volvo maintenance: heading towards 300 thousand kilometers of mileage so further updates to the schedule were needed. Hoping to make even more of them soon.

Me, myself, and I... and my Volvo 460: 440 480

Alarm and immobilizer – programming keyfob, alarm and immobilizer
Diagnostic system – retrieving, erasing and interpreting fault codes
Diagnosing the diagnostic socket itself – what to do if you don't receive any flash-codes
Interference engines
Maintenance schedule (work in progress)
Rear lamps sealing
SRS (airbag system) equipped in early models – readout of fault codes
VADIS installation instructions

...and my Volvo 850:

Diagnostic system
Maintenance schedule

Internet internals, or 'how does it actually work?'

DNS, SOA records
DNS, TTL, NXDOMAIN and related
...much more to come

OpenBSD – my operating system of choice:

authpf and bigger networks (over 800 simultaneous users, 300 000+ simultaneous active connections) – pitfalls and ideas
authpf patches
Process privacy patch
Trusted Path Execution patch

Content last reviewed on: April 7, 2011.