CCDS System Administration
Cincinnati Country Day School
Technology Office
System Administration Website
Jeffry A. Spain
Network Administrator
(513) 979-0299
IPv6 Deployment
IPv6 (Internet Protocol Version 6) is the next-generation communications protocol for the global Internet. Brief introduction here and many more resources here.
IPv6 is now in operation at CCDS in a dual-stack IPv4/IPv6 configuration. There is full, transparent IPv6 connectivity on our intranet among Windows 7 clients and Windows 2008 R2 servers, as well as IPv6 Internet access through our ISP TW Telecom.
You accessed this website from the IPv4 address What is your network protocol transition plan?
The graphic above appears as a static image for IPv4 users or as a Flash animation for IPv6 users with Adobe Flash Player installed.
The graphic at the right from Hurricane Electric depicts the IPv4 address exhaustion problem. The Number Resource Organization (NRO) announced on February 3, 2011, that the free pool of IPv4 addresses is now fully depleted.
The following CCDS websites in addition to this one are accessible from the IPv6 Internet:
Other IPv6-enabled services include:
  • Microsoft DirectAccess automatic, transparent virtual private networking for Windows 7
  • Domain Name Service: and
  • Incoming Email Service:
  • DyKnow Classroom Collaboration System (client software required)
IPv4 services in transition include:
One year after the successful World IPv6 Day on June 8, 2011, a number of major Internet service providers went live permanently with IPv6 at the World IPv6 Launch on June 6, 2012. CCDS has been providing transparent IPv6/IPv4 dual-stack Internet connectivity since the spring of 2011.
To determine your IPv6 readiness, test your connectivity at Jason Fesler’s IPv6 Test Site. View the RIPE IPv6 Eye Chart to assess your IPv6/IPv4 dual-stack Internet connectivity.
World IPv6 Launch
DNSSEC Deployment
DNSSEC (Security Extensions for the Domain Name System) uses public key cryptographic techniques to counter spoofing attacks on the Internet's name resolution system. Brief introduction here and many more resources here. CCDS has implemented DNSSEC on its authoritative name servers and The and zones are digitally signed, and secure delegations from their top-level domains are in place.
DNSSEC achieved a significant implementation milestone when VeriSign digitally signed the “com” top-level domain on March 31, 2011. See ICANN‘s report on the number of top-level domains currently enabled for DNSSEC.
The DNSSEC Analyzer at Verisign Labs confirms the integrity of the chains of trust from the root zone to our zones. Click below to analyze:
The thumbnails on the right from Sandia National Laboratories depict the DNSSEC chains of trust graphically. Click on the thumbnail images for larger, live versions. Please allow several seconds for these pages to load.
DNS Visualization
DNS Visualization
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