The IP header contains the source and destination IP addresses, the size, and other flags. The TCP segment header contains TCP port numbers, TCP control flags, and numeric values used for data ordering and integrity checking. Figure 4-4. IP packets carry TCP segments, which carry chunks of...
bytes_written() + 2; } void TCPConnection::segment_received(const TCPSegment &seg) { if (!_active) return; // 设置了RST,同时将inbound和outbound设置为error if (seg.header().rst) { close_conn(); return; } if (seg.header().syn) _syn = true; _last_segment_received_time = _cur_...
In TCP segment header, which field can implement the reliable data transfer? A. source port number and destination port number B. sequence number and ACK number C. urgent data pointer D. Receive window 相关知识点: 试题来源: 解析 B s e q uen c e number a n d AC K number ...
1.注意TCPSegment中payload() 中只有数据而没有fin和syn,但是fin和syn会分别占据一个序列号 tcp_receiver.hh #ifndef SPONGE_LIBSPONGE_TCP_RECEIVER_HH#define SPONGE_LIBSPONGE_TCP_RECEIVER_HH#include"byte_stream.hh"#include"stream_reassembler.hh"#include"tcp_segment.hh"#include"wrapping_integers.hh"#in...
MSS全称是 Maximum Segment Size,表示TCP握手时通信双方协商的最大报文段长度。 MSS计算方式: THE TCP MAXIMUM SEGMENT SIZE IS THE IP MAXIMUM DATAGRAM SIZE MINUS FORTY.(RFC879) 即MSS = MTU - IP HEADER(20字节) - TCP HEADER(20字节) RFC6691关于MSS的说明: ...
Roughly speaking, a cipher mode describes how much data is encrypted in an application of the cipher and how multiple cipher blocks can be linked together to protect larger amounts of data, such as a LAN frame or TCP segment. From a security perspective, CCMP remains strong. Cryptographic ...
The UDP Header Looking at the UDP header, you'll see there are much fewer fields in here. All we have is the source and destination port, the length, a UDP checksum, and the data. Comparing the UDP header and the TCP header, there's much less overhead with UDP, which leads us to...
It forms the pseudo header, prepends it to the actual TCP segment, and then performs the checksum (setting the Checksum field to zero for the calculation as before). If there is a mismatch between its calculation and the value the source device put in the Checksum field, this indicates ...
TCP segments are very much “jack of all trade” messages—they are flexible and serve a variety of purposes. A single field format is used for all segments, with a number of header fields that implement the many functions and features for which TCP is responsible. One of the most notable...
④ The segment represents the information in the TCP data stream;⑤ Message refers to the unit of data in the application protocol.In each layer, a header is attached to the sent data, which contains the necessary information of this layer, such as the destination address and protocol related...