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Technical data of the koltsoff.com

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DNS

HtmlToText

contact info easiest way to contact is via phone or email (czr at iki removethis dot fi). you might find me on ircnet (use /msg) and freenode (on ##kernel), but i've kind of dropped out from irc since 2015. i'm also available on linkedin® and facebook, but i only connect to people who i know personally. current valid certs: none (yay). outdated certs: rhcx (inc rhce) and mcse:sec (inc 7 variants, on 2000), mct, ccna, lpi1, hp procurve ais and hpcp. i have blog with potentially more current stuff. as of 2010-11-15 i do not plan to update these pages. not that i have done so in the past couple of years anyway. however, the pages will remain on ze interwebs for hysterical raisins. also, due to switching servers, some links might point to places that no longer exist (i intentionally left out some cruft during the move, but am too lazy to fixup the links). if you run across such a link, you may imagine the stuff that was previously found the link (if you really want to acccess it, drop me a line and i'll ask the mightly /dev/urandom how to deal with it). image galleries (very partial) random collection of photos (off-site). selected pictures from china (1998-1999) . some from mainland europe (fr/ch 2004) . ray-tracing stuff (was bored) (2006) . desktop backgrounds (2007) . you're free to guess what the subject of the photos is. zero-force knots gone wild (2007) . ocular mishaps & pixel extrapulations (2007) . the secret life of blob world (2007) . n. y. c. day 1 , day 2 (2007). georgia/florida (2007/2008) . japan (2008) . semi-random collection of links to content on this "site" (aka "public projects finished") most projects listed here were developed during 2006-2007. non-fiction book list . (in finnish) instructions on how to build custom rhel4 kernels. (in finnish) how to setup dynamic updates with bind9 in targetted selinux-environment. (in finnish) tietojärjestelmien luotettavuus , esitys ohjelmistotuotannon menetelmät -kurssille. (open document format, presentation). pdf-versio . (english: reliability in information systems, outlining the reasons why the black-box model is somewhat flawed when applied to modern systems and electronics.) step-by-step guide on implementing network security on rhel4/centos . some of the text also applies to other linux distributions. step-by-step guide on how to build out-of-tree kernel modules for the nokia n800. improved two-phase syntax high-lighter for c (demo output). why html-emails are a bad idea (excerpt of actual spam that i received). reboots for fun and profit. (you could also use reboot -f now.) a script to send an email when filesystem usage has exceeded a limit . a document that started from describing the largest differences between hp-ux and linux but since acquired a life of its own. contains typos and other brainfarts. getting root shell on unix-systems (not an exploit). google is fun. found an old asm program (size optimization contest which i started) floating around: smallpal.asm . i was 16 years old back then :-). program compiles into 79 bytes (.com) and requires dos and vga. automatic l2-topology, port and host discovery (netmap) by using only bridge-mib. sanitized example of a real network at off-office hours . hybrid python/c. what exactly is disk speed ? (full data area linear read measurements over commodity hard drives). now also featuring measurements over flash devices, sd/mmc cards, cd-roms and dvds as well as other interesting technical blip-blap. somewhat newer graphs using the automagic grapher. (includes usb "hard disks", some raid-tests and the most of the original blockspeed images.) how to answer the question "how much memory is a process using now" . tool to report memory usage for larger systems. example output for a single cpu desktop system. implemented in python. tool to display system wide memory usage once per second. quite different goals compared to meminfo. both python and c versions. (sis-related) "random access into compressed data"-format (aka rac). needed a mechanism to access the virtual machine images in random fashion without decompressing the whole thing at once so decided to implement a custom format. encoder works as filter (which is nice), decoder cannot read from stdin but can output to stdout. internally implements desparsing so that finding out whether given logical sector(s) are zero or not is an operation that doesn't require uncompression or i/o to the compressed files. the underlying compression "algorithm" is zlib (modified lz77). decompression speed is very good. here is a table comparing different compressors/decompressors on linux (i blame openoffice for the funky formatting). rac is included (a first unoptimized version). test data is a bunch of vhd-format virtual machine disk files (base or delta). rac-codecs implemented in c. completed. zerotools , a toolset that aids in keeping virtual machine disks cleaner by filling released virtual disk space with binary zeroes. also acts as a template on implementing a generic ld_preload-based wrapper. implemented in c. a small and simple utility to do chroot, cwd, drop-priv and exec all in one go. implemented in c. current projects (in no particular order) all computer/networking related stuff is done using python/c/asm on linux (obviously). moomeek: replacement for rlplot for blockspeed . implemented in c with libfreetype and libpng as the only external dependencies. semi-active (not feature complete). blockspeed : add rpm-measurement (rethink), try whether overlapping aio ops will hide the cache mess, cache-banging tests (for hba-tests), cache-mod-bang test (sector n stays constant), do some runs on scsi stuff and pls. on hold. a7 (multipurpose custom init-replacement and hw boot-strap mechanism, and much much more. screenshot from pxe-booted version). another screenshot in which regular top and bash are running. footprint of a7 (a7slave) is pretty minimal as you can see (80kib unique data and code, including dirty stack). implemented in c as a single binary implementing functionality of udevd, modprobe, init and automatic hardware bootstrapping and network init, however the version in screenshot is linked against a regular dynamic glibc (hence the large size). boots quickly (especially over network). on hold. efficient storage and graphing of time-series measured sparse datasets (rrdtool is not efficient). implemented in c, but prototypes currently in python. on hold. de-centralized multi-site l2-admission control system. custom radius/dhcp with topology tracking. pxe/wol thrown in as a bonus. hybrid python/c. on hold. l2-topology based host/service alerting (see netmap above) via sms. hybrid python/c. on hold. trafstat2: adding multi-vlan support over mirror-switch ports into trafstat. on hold. docs-1250: a docs-midway replacement that uses synhilite, generates automatic dependency info for make and outputs xhtml/strict (zerotools and user-chroot pages are generated with this). implemented in python. "complete". snarfcontrol: making automatic config backups after switch (procurve) configs change. integrated as part of ssh/menu-driven switch management system. contains a single-shot tftp server, telnet scrubbing, as well as multiple control daemons and wrappers. implemented in python and c. active. spectre: network booted multicasting imaging system for large environments (ntfs primary target). imaging clients will run linux (as well as the server(s)). will be released as gpl. hybrid python/c. waiting for sponsorship(s). projects on hold/completed non-public these projects are still all useful/necessary/fun, but mostly they're waiting for better times or they're already complete, but i'm too lazy to make example outputs/screenshots. most projects listed here were started/developed during 2005-2007. ionos: combine trafstat2, scannet and real-time netmap. hybrid python/c. not properly started. layer 2 love machine (l2lm): client-server solution to combine separate l2 lans transparently across multipl

URL analysis for koltsoff.com

http://www.koltsoff.com/pub/pics/japan-2008/
http://www.koltsoff.com/pub/a7/a7-2006-05-14.png
http://www.koltsoff.com/pub/smallpal-1994/smallpal.asm
http://www.koltsoff.com/pub/luotettavuus.pdf
http://www.koltsoff.com/pub/pics/blob-world-2007/
http://www.koltsoff.com/pub/cloud9/cloud9.png
http://www.koltsoff.com/pub/pics/xmas-2007/
http://www.koltsoff.com/pub/ures/
http://www.koltsoff.com/pub/zerotools/
http://www.koltsoff.com/pub/call-me-ray/
http://www.koltsoff.com/pub/pics/china1998/
http://www.koltsoff.com/pub/pics/nyc2/
http://www.koltsoff.com/pub/netmap/netmap-clean.html
http://www.koltsoff.com/pub/checkfs/
http://www.koltsoff.com/pub/userchroot/

Whois Information

Whois is a protocol that is access to registering information. You can reach when the website was registered, when it will be expire, what is contact details of the site with the following informations. In a nutshell, it includes these informations;

Domain Name: KOLTSOFF.COM
Registrar URL: http://www.godaddy.com
Registrant Name: Aleksandr Koltsoff
Registrant Organization:
Name Server: NS1.LINODE.COM
Name Server: NS2.LINODE.COM
Name Server: NS3.LINODE.COM
Name Server: NS4.LINODE.COM
Name Server: NS5.LINODE.COM
DNSSEC: unsigned

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http://who.godaddy.com/whoischeck.aspx?domain=KOLTSOFF.COM

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and solicitations of any kind, including spam. You further agree
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including mining this data for your own personal or commercial purposes.

Please note: the registrant of the domain name is specified
in the "registrant" section. In most cases, GoDaddy.com, LLC
is not the registrant of domain names listed in this database.

  REGISTRAR GODADDY.COM, LLC

  REFERRER http://www.godaddy.com

SERVERS

  SERVER com.whois-servers.net

  ARGS domain =koltsoff.com

  PORT 43

  SERVER whois.godaddy.com

  ARGS koltsoff.com

  PORT 43

  TYPE domain

DOMAIN

  NAME koltsoff.com

NSERVER

  NS1.LINODE.COM 162.159.27.72

  NS2.LINODE.COM 162.159.24.39

  NS3.LINODE.COM 162.159.25.129

  NS4.LINODE.COM 162.159.26.99

  NS5.LINODE.COM 162.159.24.25

STATUS
clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
clientRenewProhibited https://icann.org/epp#clientRenewProhibited
clientTransferProhibited https://icann.org/epp#clientTransferProhibited
clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited

  CHANGED 2010-12-20

  CREATED 2001-02-18

  EXPIRES 2020-02-18

OWNER

ADMIN

TECH

  REGISTERED yes

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