Mixing network technologies Mixing network technologies Hass usg Jae Hosts using TCP/P Hosts using TCP/IP From the view of Ip gateway ATM provides a link Hosts using ATM口 Hosts using ATM From the view of ATM Software on two IP gateways acts like Mixing network technologies Chapter 5: Tunneling and Application Gateway 中二苧 Chapter goal: Multiprotocol environment ng network te Encapsulation and tunneling a Dynamic circuit allocation s Clients and servers in constrained The static scheme needs N*(N-1)/2 circuit environments Each circuit requires both hardware and Application gateways software resources Application gateway example: The dynamic scheme allocate circuit on demand Tunneling through an IP lation and tunneling internet capsulation refers to how the network interface Most tunneling now occurs because vendors use -cpri rs oooe iver packets from ervice to carry packets IP now provides the widest connective IP encapsulates each datagram in a packet when it mong the computers at most organizations. Software urrentby available that uses Ip to carry IPX, SNA and other high-level nsport delivery service to send datagram from difference: whether IP transmits data In a IP network can also be used to carry new dware packets or uses a high otoc ffic, to allow de ug new protocols2 哈工大计算机学院 李全龙 Network Application Development Tunneling and Application Gateway 7 Mixing network technologies … Hosts using TCP/IP Ethernet1 … Hosts using TCP/IP Ethernet2 Wide area network that uses ATM Hosts using ATM Hosts using ATM IP gateway IP gateway 哈工大计算机学院 李全龙 Network Application Development Tunneling and Application Gateway 8 Mixing network technologies „ From the view of IP gateway „ ATM provides a link „ From the view of ATM „ Software on two IP gateways acts like application software … Hosts using TCP/IP Ethernet1 … Hosts using TCP/IP Ethernet2 Wide area network that Hosts using ATM uses ATM Hosts using ATM IP gateway IP gateway 哈工大计算机学院 李全龙 Network Application Development Tunneling and Application Gateway 9 Mixing network technologies „ Dynamic circuit allocation „ The static scheme needs N*(N-1)/2 circuit „ Each circuit requires both hardware and software resources „ The dynamic scheme allocate circuit on demand … Hosts using TCP/IP Ethernet1 … Hosts using TCP/IP Ethernet2 Wide area network that Hosts using ATM uses ATM Hosts using ATM IP gateway IP gateway 哈工大计算机学院 李全龙 Network Application Development Tunneling and Application Gateway 10 Chapter 5: Tunneling and Application Gateway Chapter goal: „ Multiprotocol environment „ Mixing network technologies „ Encapsulation and tunneling „ Clients and servers in constrained environments „ Application gateways „ Application gateway examples 哈工大计算机学院 李全龙 Network Application Development Tunneling and Application Gateway 11 Encapsulation and tunneling „ Encapsulation refers to how the network interface uses packet switching hardware. „ Tunneling refers to the use of a transport network service to carry packets or messages from another service. „ IP encapsulates each datagram in a packet when it uses the hardware directly. „ IP creates tunnel when it uses a high-level transport delivery service to send datagram from one point to another. „ Key difference: whether IP transmits datagrams in hardware packets or uses a high-level transport service 哈工大计算机学院 李全龙 Network Application Development Tunneling and Application Gateway 12 Tunneling through an IP internet „ Most tunneling now occurs because vendors use IP protocols to deliver packets from non-TCP/IP protocols. „ IP now provides the widest connectivity among the computers at most organizations. „ Software is currently available that uses IP to carry IPX, SNA and other high-level protocol traffic. „ IP network can also be used to carry new protocols traffic, to allow designers to build and debug new protocols