Richards said one of the main challenges faced is ensuring that communication between IPv4 and IPv6 domains continues to work seamlessly and that security is maintained during the transition period.

"We plan to commence a study of the many devices that will enable the two protocols to inter-operate on single network architecture, as each has its own unique pros and cons," he said.

Another challenge, according to Richards, is selling the IPv6 concept, as it is relatively unknown, even within the IT community.

"When the CIO mandated the transition, the responses internally ranged from jubilation to despair. Like most technology professionals, Defence's IT staff are busy, and some viewed the transition as being for change's sake alone, which is not the case," he said.

Defence plans to hold a number of educational programs internally to educate staff about the advantages and also potential problems of IPv6, though the department is also trying to "sell" the technology to external stakeholders.