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Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Strawberry and Banana Jam; The Best Of All Possible Worlds; Kenzaburo Oe: The Changeling; Peach Jam; Taste Test; Strawberry and Raspberry Jam; flac to mp3 on OpenSuse 42.1; Also, Sebald; Kenzaburo Oe Interview; Otake (Kitani Minoru) move Black 121; Is free speech in British universities under threat?; I am actually good at computers; Was This Mansplaining?; WebFaction / LetsEncrypt / General Disappointment; Sensible Philosophy of Science; George Ellis; Misplaced Intuition and Online Communities; More Reading About Japan; Visibilty / Public Comments / Domestic Violence; Ferias de Santiago; More (Clearly Deliberate); Deleted Obit Post; And then a 50 yo male posts this...; We Have Both Kinds Of Contributors; Free Springer Books; Books on Religion; Books on Linguistics; Palestinan Electronica; Books In Anthropology; Taylor Expansions of Spacetime; Info on Juniper; Efficient Stream Processing; The Moral Character of Crypto; Hearing Aid Info; Small Success With Go!; Re: Quick message - This link is broken; Adding Reverb To The Echo Chamber; Sox Audio Tools; Would This Have Been OK?; Honesty only important economically before institutions develop; Stegangraphy via PS4; OpenCL Mess; More Book Recommendations; Good Explanation of Difference Between Majority + Minority; Musical Chairs - Who's The Privileged White Guy; I can see straight men watching this conversation and laffing; Meta Thread Defending POC Causes POC To Close Account; Indigenous People Of Chile; Curry Recipe; Interesting Link On Marginality; A Nuclear Launch Ordered, 1962; More Book Recs (Better Person); It's Nuanced, And I Tried, So Back Off; Marx; The Negative Of Positive; Jenny Holzer Rocks; Huge Article on Cultural Evolution and More; "Ignoring language theory"; Negative Finger Counting; Week 12; Communication Via Telecomm Bids; Finding Suspects Via Relatives' DNA From Non-Crime Databases; Statistics and Information Theory; Ice OK in USA; On The Other Hand; (Current Understanding Of) Chilean Taxes / Contributions; M John Harrison; Playing Games on a Cloud GPU; China Gamifies Real Life; Can't Help Thinking It's Thoughtcrime; Mefi Quotes; Spray Painting Bike Frame; Weeks 10 + 11; Change: No Longer Possible To Merge Metadata; Books on Old Age; Health Tree Maps; MRA - Men's Rights Activists; Writing Good C++14; Risk Assessment - Fukushima; The Future of Advertising and Surveillance; Travelling With Betaferon; I think I know what I dislike so much about Metafilter; Weeks 8 + 9; More; Pastamore - Bad Italian in Vitacura; History Books; Iraq + The (UK) Governing Elite; Answering Some Hard Questions; Pinochet: The Dictator's Shadow; An Outsider's Guide To Julia Packages; Nobody gives a shit; Lepton Decay Irregularity; An Easier Way; Julia's BinDeps (aka How To Install Cairo); Good Example Of Good Police Work (And Anonymity Being Hard); Best Santiago Burgers; Also; Michael Emmerich (Vibrator Translator) Interview (Japanese Books); Clarice Lispector (Brazillian Writer); Books On Evolution; Looks like Ara (Modular Phone) is dead

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PPOE on OpenSuse

From: "andrew cooke" <andrew@...>

Date: Wed, 10 Dec 2008 17:48:14 -0300 (CLST)

Just got a new internet connection via the phone company (ASDL) rather
than cable TV.

The following comments probably don't apply to most people, but I use my
Linux (opensuse 11) box directly as the main firewall/router (rather than
connecting the phone company's mode to a wireless router or whatever).

That means I had to configure Linux to talk PPPOE, which was a little
frustrating.  As far as I can tell the YAST scripts are buggy - they tend
to hang and prompt for inconsistent fields.

After going round in many circles, I don't have a clear idea of what I
did, but basically to convert from ethernet/cable to PPOE You seem to need
to:

- Install the smpppd daemon (including chkconfig -a)
- Disable named if you are using it
- Use YaST Network Devices pane:
-- In Network Settings change the "external" network card to have no
   address and no DHCP
-- In DSL create a new entry (PPP over Ethernet) with a new provider
   selecting the options "Modify DNS when connected", "Automatically
   Retrieve DNS" and "Automatically Reconnect"
- Reboot

I haven't found any alternative to rebooting (/etc/init.d/network restart
doesn't cut it).

Note that I haven't yet got local DNS working (I disabled it because it
was making everything else more complex).

Andrew

Slowly making more sense

From: "andrew cooke" <andrew@...>

Date: Wed, 10 Dec 2008 22:44:41 -0300 (CLST)

OK, to create the dsl0 interface, use
  ifup dsl0
similarly, to take it down
  ifdown dsl0

And named (bind) works just fine - follow the instructions in
/etc/resolv.conf to stop ppp from updating the DNS (and update the
resolvers list for named if necessary)

Andrew

Script to Check for dsl0

From: "andrew cooke" <andrew@...>

Date: Sun, 14 Dec 2008 09:31:31 -0300 (CLST)

The dsl0 device was down this morning; I have added the following script
to /etc/cron.hourly so that it is brought back up automatically:

#!/bin/bash

log="/var/log/smpppd/check.log"

touch "$log"
date >> "$log"

exists=`ifconfig | grep dsl0`
if [ "$exists" ]
then
  echo "dsl0 exists" >> "$log"
else
  echo "dsl0 down" >> "$log"
  ifup dsl0 >> "$log" 2>&1
fi

However, the current setup involves having a satellite dish (ISP provides
digital TV too) and there's a rumour the neighbours are unhappy, so I
don't know what will happen in the future...

Andrew

Updated PPOE Script, Extra Tricks for WebMail

From: "andrew cooke" <andrew@...>

Date: Sat, 10 Jan 2009 09:04:38 -0300 (CLST)

I've updated the script (below) to include knockd which, if you use it,
must also be restarted (otherwise you will be locked out of the system,
presumably).  Remove the block of lines associated with knockd if it is
not used.

The retry loop is not really needed, but the sleep is (ifup returns before
knockd can be started).

Also, this seems to allocate a new address.  If you are using a dynamic
address (eg dyndns) then it will update, but the cache on the machine you
are using to access my be incorrect.

There are actually two caches: the OS cache and one in Firefox.  To flush
the Linux cache, use
  sudo /etc/init.d/nscd restart
(the Name Service Cache Daemon caches names...).  To fix Firefox either
exit and restart or follow the instructions at
http://www.techiecorner.com/225/how-to-disable-firefox-dns-cache/ (you
still need to restart the first time you do that, but not in future).

Andrew


#!/bin/bash

# must be run by root

log="/var/log/smpppd/check.log"

touch "$log"
date >> "$log"

for retry in [1,2,3]
do
  exists=`ifconfig | grep dsl0`
  if [ "$exists" ]
  then
    echo "dsl0 exists" >> "$log"
  else
    echo "dsl0 down" >> "$log"
    ifup dsl0 >> "$log" 2>&1
    echo "pause 10 secs..." >> "$log"
    sleep 10
  fi
done

running=`/etc/init.d/knockd status | grep run`
if [ "$running" ]
then
  echo "knockd running" >> "$log"
else
  echo "knockd unused" >> "$log"
  /etc/init.d/knockd start >> "$log" 2>&1
fi

PPPoE on OpenSuse 12.3

From: andrew cooke <andrew@...>

Date: Thu, 11 Apr 2013 10:01:14 -0300

Some things never change :o)

Found out how to get my modem into "bridge mode" and so am using PPPoE again.

Note that Yast config of DSL is broken.  You can use it to configure (once!)
but then it doesn't show the configured DSL.  Despite that, if you are
careful (yo uhave only one try!) you can get it to work...

https://bugzilla.novell.com/show_bug.cgi?id=804009

Andrew

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