Bupa (pronounced /buËpÉ/) is an international healthcare group, with its origins and headquarters in the United Kingdom but now serving 32 million customers in 190 countries. It is a not-for-profit private healthcare company, as opposed to the UK's National Health Service (NHS), which is a tax-funded healthcare system.
IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite, while some other Internet security systems in widespread use, such as Transport Layer Security (TLS) and Secure Shell (SSH), operate in the upper layers at the Transport Layer (TLS) and the Application layer (SSH).
IPSec transport mode (encrypting an IP GRE tunnel) is a commonly deployed option because it provides all the advantages of using IP GRE, such as IP Multicast protocol support (and, thus, also the support of routing protocols that utilize IP Multicast) and multiprotocol support.