| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

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

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; Index - Translations From Chile; More Emotion in Chilean Wines; Week 7; Aeon Magazine (Science-ish); QM, Deutsch, Constructor Theory; Interesting Talk Transcripts; Interesting Suggestion Of Election Fraud; "Hard" Books; Articles or Papers on depolarizing the US; Textbook for "QM as complex probabilities"; SFO Get Libor Trader (14 years); Why Are There Still So Many Jobs?; Navier Stokes Incomplete; More on Benford; FBI Claimed Vandalism; Architectural Tessellation; Also: Go, Blake's 7; Delusions of Gender (book); Crypto AG DID work with NSA / GCHQ; UNUMS (Universal Number Format); MOOCs (Massive Open Online Courses); Interesting Looking Game; Euler's Theorem for Polynomials; Weeks 3-6; Reddit Comment; Differential Cryptanalysis For Dummies; Japanese Graphic Design; Books To Be Re-Read; And Today I Learned Bugs Need Clear Examples; Factoring a 67 bit prime in your head; Islamic Geometric Art; Useful Julia Backtraces from Tasks; Nothing, however, is lost with less discomfort than that which, when lost, cannot be missed; Article on Didion; Cost of Living by City; British Slavery; Derrida on Metaphor; African SciFi; Traits in Julia; Alternative Japanese Lit; Pulic Key as Address (Snow); Why Information Grows; The Blindness Of The Chilean Elite; Some Victoriagate Links; This Is Why I Left StackOverflow; New TLS Implementation; Maths for Physicists; How I Am 8; 1000 Word Philosophy; Cyberpunk Reading List; Detailed Discussion of Message Dispatch in ParserCombinator Library for Julia; FizzBuzz in Julia w Dependent Types; kokko - Design Shop in Osaka; Summary of Greece, Currently; LLVM and GPUs; See Also; Schoolgirl Groyps (Maths); Japanese Lit; Another Example - Modular Arithmetic; Music from United; Python 2 and 3 compatible alternative.; Read Agatha Christie for the Plot; A Constructive Look at TempleOS; Music Thread w Many Recommendations; Fixed Version; A Useful Julia Macro To Define Equality And Hash; k3b cdrom access, OpenSuse 13.1; Week 2; From outside, the UK looks less than stellar; Huge Fonts in VirtualBox; Keen - Complex Emergencies; The Fallen of World War II; Some Spanish Fiction; Calling C From Fortran 95; Bjork DJ Set; Z3 Example With Python; Week 1; Useful Guide To Starting With IJulia; UK Election + Media; Review: Reinventing Organizations; Inline Assembly With Julia / LLVM; Against the definition of types; Dumb Crypto Paper; The Search For Quasi-Periodicity...; Is There An Alternative To Processing?; CARDIAC (CARDboard Illustrative Aid to Computation); The Bolivian Case Against Chile At The Hague; Clear, Cogent Economic Arguments For Immigration; A Program To Say If I Am Working; Decent Cards For Ill People; New Photo

© 2006-2015 Andrew Cooke (site) / post authors (content).

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

Comment on this post