with open-source solutions and currently am in charge of over 50 physical and about the double amount of virtualized linux servers.
Over the years I developed my skills and worked extensively with majority of well-known daemons which are, today, essential for almost every business worldwide:
Let me just make a list:
- squid (with or without dansguardian+clamav as content filter/realtime AV)
- snort IPS (with BASE and Snorby as web GUI)
- iptables (with or without web GUI)
- BIND (standalone or master/slave)
- postfix (as MTA, combined with alot of different tools such as spamassassin, amavis, clamav, roundcube, postfixadmin, dovecot, cluebringer, mailgraph)
- zenoss (with plugins and OUIs)
- dovect (as pop3/imap server of choice, combined with postfix and amavis, clamav, roundcube, postfixadmin, spamassassin)
- amavis (with alot of customized settings for things such as double AV scanning, DKIM support, catching of spam headers...)
- spamassassin (standard and heuristic bayesian analysis, fine tuning of scoring, OCR integration, SPF integration....)
- ClamAV (using both standard and unofficial virus definitions, making of 0-day virus signatures caught in the wild...)
- freeradius (with MySQL backend for AAA)
- samba (in all possible variatons - standalone simple CIFS sharing, member of windows AD, standalone AD controller, one of the controllers in windows AD)
- vsftpd and proftpd (as standalone servers or with virtual users)
etc.
Please contact me for more information.