| 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

Telephone System Quotes for Cat Soft LLC; Even; Cherry Jam; Lebanese Writer Amin Maalouf; Learning From Trump; Chinese Writer Hu Fayun; C++ - it's the language of the future; And; Apricot Jam; Also; Excellent Article on USA Politics; Oh Metafilter; Prejudice Against The Rurals; Also, Zizek; Trump; Why Trump Won; Doxygen + Latex on CentOS 6; SMASH - Solve 5 Biggest Problems in Physics; Good article on racism, brexit, and social divides; Grandaddy are back!; Consciousness From Max Entropy; Democrats; Harvard Will Fix Black Poverty; Modelling Bicycle Wheels; Amusing Polling Outlier; If Labour keeps telling working class people...; Populism and Choice; Books on Defeat; Enrique Ferrari - Argentine Author; Transcript of German Scientists on Learning of Hiroshima; Calvert Journal; Owen Jones on Twitter; Possible Japanese Authors; Complex American Literature; Chutney v5; Weird Componentized Virus; Interesting Argentinian Author - Antonio Di Benedetto; Useful Thread on MetaPhysics; RAND on fighting online anarchy (2001); NSA Hacked; Very Good LRB Article on Brexit; Nussbaum on Anger; Tasting; Apple + Kiwi Jam; Hit Me; Sudoku - CSP + Chaos; Recycling Electronics In Santiago; Vector Displays in OpenGL; And Anti-Aliased; OpenGL - Render via Intermediate Texture; And Garmin Connect; Using Garmin Forerunner 230 With Linux; (Beating Dead Horse) StackOverflow; Current State of Justice in China; Axiom of Determinacy; Ewww; Fee Chaos Book; Course on Differential Geometry; Okay, but...; Sparse Matrices, Deep Learning; Sounds Bad; Applebaum Rape; Tomato Chutney v4; Have to add...; Culturally Liberal and Nothing More; Weird Finite / Infinite Result; Your diamond is a beaten up mess; Maths Books; Good Bike Route from Providencia / Las Condes to Panul; Iain Pears (Author of Complex Plots); Plum Jam; Excellent; More Recently; For a moment I forgot StackOverflow sucked; A Few Weeks On...; Chilean Book Recommendations; How To Write Shared Libraries; Jenny Erpenbeck (Author); Dijkstra, Coins, Tables; Python libraries error on OpenSuse; Deserving Trump; And Smugness; McCloskey Economics Trilogy; cmocka - Mocks for C; Concept Creep (Americans); Futhark - OpenCL Language; Moved / Gone; Fan and USB issues; Burgers in Santiago; The Origin of Icosahedral Symmetry in Viruses; autoenum on PyPI; Jars Explains; Tomato Chutney v3; REST; US Elections and Gender: 24 Point Swing; PPPoE on OpenSuse Leap 42.1; SuperMicro X10SDV-TLN4F/F with Opensuse Leap 42.1; Big Data AI Could Be Very Bad Indeed....; Cornering; Postcapitalism (Paul Mason); Black Science Fiction

© 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