main current interest:

functional programming ( haskell / erlang ) programming concurrent processes ( erlang / haskell ) best practice system administration based on linux

programming languages:

solid

python, perl, POSIX compatible shell, sql

some skill

scheme, erlang, haskell

basic skill

C, common lisp, php, ocaml

operating systems:

gnu/linux

• Debian (maintainer and enthusiast, lots of experience, i386, powerpc, arm. with one colleague migrated 200 servers to centralised configuration management (puppet) and kept the up to date for 2 years.

• Suse

• openwrt, freewrt (embedded, mipsel architecture, minor porting)

• some Gentoo, Redhat

others

• some freebsd, including debian gnu/freebsd

• some openbsd, mac os x, windows server administration

network related:

• firewall/internet gateway: linux kernel, shorewall, firehol, quality of service (shaping)

• virtual private network: openvpn, ipsec

• wlan: bridge, repeater and hotspot style setups, olsrd, babel for dynamic routing - see: funkfeuer.at

• ipv6: 6to4, via tunnels, use for vpn setups, autoconfiguration

• security auditing: nmap, ettercap, nessus, john

• security monitoring: arpwatch, snort, tiger, logcheck

• general security know-how: howtos, maillists, ...

• service monitoring: nagios, munin, smokeping, cacti, collectd, zenoss

traditional unix services and daemons:

• email and scanning: exim4, courier, postfix, mailman (including big newsletters)

• spamassassin, clamav, fetchmail, greylisting

• web: apache(2), nginx, yaws, fastcgi, modpython, modperl, mod_php

• dns: bind, djbdns, powerdns

• databases: mysql, postgresql, sqlite, berkelydb

• file sharing: nfs, samba

• graphical terminal software: X, nx, rdp, citrix

• web cache: squid, varnish

• proftpd, vsftpd

authorization and access control

• pam in many variants

• ldap (sync with MS active directory)

• kerberos (and integration with MS active directory, single sign on)

web applications

• catalyst (major project, development for about 6 months)

• turbogears "rails" framework in python (development)

• wiki software: moinmoin, ikiwiki, twiki, socialtext (user / admin / minor hacking)

• issue tracking: roundup, request tracker (administration and minor hacking)

• zope/plone (administration and minor hacking)

applied mathematics

understanding of cryptographic protocols and algorithms

favourite productivity tools

emacs (recently lots of it, actually), screen, ratpoison, xmonad, mutt, zsh, unison, git, darcs, gnupg, gimp...