TCP has limited support for congestion control These congestion control algorithms are slow to adapt to new path characteristics, creating inefficiencies at the transport layer when the path characteristic changes are significant. 口拥塞控制适应mobility
◼ TCP has limited support for congestion control ◼ These congestion control algorithms are slow to adapt to new path characteristics, creating inefficiencies at the transport layer when the path characteristic changes are significant. 拥塞控制适应mobility
Solving Mobility Above the Network Layer ■ Reconfiguration of the host for its new network:Protocols discussed in Chapter 1, “ntroduction to“Mobility”,”such as Dynamic Host Configuration Protocol (DHCP),IP auto-configuration,and router discovery mechanisms,are widely deployed techniques for accomplishing this function. Ensuring reachability for new connections:Protocols discussed in Chapter 2, "Internet "Sessions","such as Dynamic DNS,provide sufficient capabilities for this function. Updating existing connections and rebinding these connections to the new IP address:Numerous protocols can provide this function
Solving Mobility Above the Network Layer
Stream Control Transmission Protocol natively supports multiple addresses per host, and allows the addition or deletion of addresses from an existing association Multipath TCP extensions to the original TCP to support many of the functions defined by SCTP ■MSOCKS relies on a proxy to provide seamless mobility of the mobile node
◼ Stream Control Transmission Protocol natively supports multiple addresses per host, and allows the addition or deletion of addresses from an existing association ◼ Multipath TCP extensions to the original TCP to support many of the functions defined by SCTP ◼ MSOCKS relies on a proxy to provide seamless mobility of the mobile node
常规TCP ■三次握手建立连接 ■全双工传输 ■三次握手建立连接 ■拥塞控制 口滑动窗口
常规TCP ◼ 三次握手建立连接 ◼ 全双工传输 ◼ 三次握手建立连接 ◼ 拥塞控制 滑动窗口
SCTP Point-to-point connections Connection-oriented services Reliable delivery Congestion control mechanism Packet loss recovery ■Rate adaptation
SCTP ◼ Point-to-point connections ◼ Connection-oriented services ◼ Reliable delivery ◼ Congestion control mechanism ◼ Packet loss recovery ◼ Rate adaptation