Community Research and Development Information Service - CORDIS

Deployment of IPv6 in Greek school networks

A short description of the reasoning behind the adoption of IPv6 in the Greek School Network (and probably the most practical goal we intended to achieve by deploying the new protocol version in a working network) was to replace the NAT scheme we were using for each site connected to the GSN. The decision to use NAT was taken at the early design phase of the network in the light of the unavailability of IP addresses. This scheme allowed us to interconnect about 5000 sites all over Greece. However today, and because of the NAT, we have to deal with many problems when trying to provide certain services to the remote sites. Teleconferencing is an example service with such problems. The following paragraphs present the actions CTI undertook in the framework of 6net. The project was divided into four discrete steps/tasks.

Task 1: The Study and Definition of Transition Strategy, IPv6 Addressing and IPv6 Routing Plan The first step was the definition of the Transition Strategy that should be followed in order to transform the GSN IPv4-only network to a dual stack (IPv4/IPv6) network. The design of IPv6 Addressing Plan and Routing Scheme for the “new” network was also decided at this early stage. The main focus of the address plan was on the Unicast address structure, and more specifically on the ‘global and site aggregatable addresses’. The Link local addresses did not need design consideration as the assignment on Cisco routers is done automatically, while the global and site addresses needed manual provisioning.

Task 2: The deployment of IPv6 in Distribution Network (Dual Stack Network) The next step was the deployment of IPv6 in the Distribution Network. For this purpose the following actions were necessary: o The IOS upgrade in the main routers (Cisco 7206VXR) of the Distribution Network to a version that supports IPv6. Special attention was paid at the undisruptable operation of the services provided prior to the IPv6 deployment. o The implementation of the IPv6 Addressing Scheme. o The setup of the designed Routing Scheme. o The verification of the smooth operation of the infrastructure.

Task 3: The Selection of Schools and their Preparation In the third step, the schools that are included in the project were selected. These schools connect to the network using ADSL. Schools with ADSL connections are more suitable to become the first testbed for the deployment of IPv6 since these schools are connected to the PoPs of Athens and Thessalonica. The only two Broadband Remote Access Servers (BBRAS) of the ADSL provider are hosted in these two towns. Since the IPv6 protocol is not supported by all types of equipment that is installed to the schools, we made all the needed hardware changes and upgrades to the equipment of the chosen schools in order to gain full support to the IPv6 protocol.

Moreover, for each school we prepared and setup the new configurations for the routers. The last necessary action for ipv6 support in the remote sites was to enable ÉPv6 in the School PC Labs. In these labs the majority of hosts run on various versions of Windows operating system and in a smaller number of schools there is a Linux host too. Task 4: Enabling IPv6 in Basic and Advanced Services of GSN The last step involved the change of certain services in order to become IPv6 aware. These services are the Directory Service (SUN ONE Directory Server is used), the Radius Server which performs the Authentication Authorization and Accounting - AAA operations (Radius Server is used), the Domain Name Service (Bind Name Server is used), the Web Service (Apache Web Server is used), Electronic Mail Service (Qmail is used) and the Instant Messaging Service (jabber is used).

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University of Patras and Research Academic Computer Technology Institute
PO Box 1122
26504 PATRAS
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