The HSCN IP addressing policy is designed to future proof connectivity for health and social care in the longer term. With the advent of cloud technologies and internet enabled applications the NHS will inevitably move towards an internet centric approach. The adoption of Réseaux IP Européens (RIPE) assigned addresses throughout the core of the network, and a move towards the same for all endpoints, will support the eventual move to a cloud/internet based solution.
The HSCN IP addressing policy provides the flexibility to connect either with or without Network Address Translation (NAT). However, HSCN mandates the use of a public (RIPE assigned) address at the point of connection for all new sites, whilst migrated sites may maintain a legacy addressing scheme where there is a technical or business requirement to do so. To meet with this requirement, NAT will be configured at the end-site HSCN customer-premises equipment (CPE). This section provides detail on how NAT works and the importance of taking a co-ordinated approach to its deployment.