Dan S. Ritter

81 Totten Pond Road Waltham, MA 02453


Hands-on leader of IT operations groups. I have broad and deep security, systems and network skills. I teach, train, lead and toolsmith. I like to operate reliable networks at companies where I can both teach and learn. I effectively communicate with clients, technical and less-technical employees, and CEOs.

What I Have Done:

Where I Have Worked:

Hardware and Operating Systems:

I can rack machines and know a Mauser rifle from a javelin, and also the difference between Cat5 and Cat6.

x86, ARM, SPARC, Alpha platforms; multiple router, switch and firewall platforms including Cisco and Juniper; administration of UNIX (Solaris, NetBSD, OpenBSD), Linux (Debian, Ubuntu, Red Hat, SuSE), MacOS and Windows

Network Infrastructure:

BGP (Cisco IOS, JUNOS, GateD, Zebra/Quagga), RIP, OSPF, DHCP, DNS (BIND, djbdns, unbound), SMTP (Sendmail, Postfix, Exim, qmail), POP, IMAP (Courier, Cyrus, Dovecot), NIS, LDAP, RADIUS, NTP, NFS, Samba, SNMP, HTTP ( Apache, lighttpd, nginx), load balancers, NNTP, many others.

Security Tools:

IPF, pf, Netfilter/iptables/ip6tables, tcp_wrappers, Snort, nmap, Nessus, ethereal, netcat, Juniper Junos, Cisco IOS, Cisco PIX

Languages & Major Applications:

Perl, Ruby, Python, bash; RT, mrtg, cacti, observium, librenms; nagios/icinga, mon; Oracle, PostgreSQL, MySQL; JIRA, Confluence, Dokuwiki, NextCloud, Jitsi, Asterisk PBX; Tuttle and Chef.
Obsolete: Siebel, Vantive, Remedy, HP OpenView, Cabletron Spectrum…


1992-1996 Binghamton University, Thomas J. Watson School of Engineering and Computer Science