随笔分类 -  Network

TCP Control in Detail
摘要：Retransmission TCP sets a timer when it sends data, and if the data is not acknowledged when the timer expires, a timeout or timer-based retransmissio 阅读全文
posted @ 2020-05-12 18:30 ToRapture 阅读(129) 评论(0) 推荐(0)
TCP Connection in Detail
摘要：Reset In general, a reset is sent by TCP whenever a segment arrives that does not appear to be correct for the referenced connection. The reset segmen 阅读全文
posted @ 2020-05-12 17:48 ToRapture 阅读(143) 评论(0) 推荐(0)
TCP Headers in Detail
摘要：Timestamp option http://www.networksorcery.com/enp/protocol/tcp/option008.htm Timestamp Value (TSval). 32 bits. This field contains the current value 阅读全文
posted @ 2020-05-12 17:19 ToRapture 阅读(143) 评论(0) 推荐(0)
TCP learn
摘要：Headers Connection Management State Tansition Diagram Sequence Diagram Normal Simultaneous Open Simultaneous Close Half Close Normal with State Exampl 阅读全文
posted @ 2020-05-09 17:48 ToRapture 阅读(190) 评论(0) 推荐(0)
Endianness
摘要：What is endianness? Little and big endian are two ways of storing multibyte data types ( int, float, etc). In little endian machines, last byte of bin 阅读全文
posted @ 2020-05-09 16:46 ToRapture 阅读(174) 评论(0) 推荐(0)
tcpdump learn
摘要：Docs and Articles Manpage of TCPDUMP Manpage of PCAP-FILTER Examples of using tcpdump on the command line tcpdump命令详解 Capture of tcp 阅读全文
posted @ 2020-05-09 15:00 ToRapture 阅读(101) 评论(0) 推荐(0)
Learning of DNS
摘要：Headers Lables Each label can be up to 63 characters long, and an entire FQDN(fully qualified domain name) is limited to at most 255 (1-byte) characte 阅读全文
posted @ 2020-05-03 13:37 ToRapture 阅读(233) 评论(0) 推荐(0)
UDP and netstat
摘要：Do some experiment about UDP by Python3 and netstat. Code # coding: utf-8 import socket from IPython import embed def main(): sock = socket.socket(soc 阅读全文
posted @ 2020-04-28 12:49 ToRapture 阅读(172) 评论(0) 推荐(0)
UDP learn by Python3
摘要：Find max packet size # coding: utf-8 import socket def find_max_udp_packet_size(): sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) max_sz = 0 阅读全文
posted @ 2020-04-27 18:30 ToRapture 阅读(145) 评论(0) 推荐(0)
UDP headers and checksum
摘要：UDP headers Headers for computing checksum The checksum computation is similar to the Internet checksum computation. #include <bits/stdc++.h> #define 阅读全文
posted @ 2020-04-27 14:03 ToRapture 阅读(332) 评论(0) 推荐(0)
routetrace
摘要：Command https://linux.die.net/man/8/traceroute This program attempts to trace the route an IP packet would follow to some internet host by launching p 阅读全文
posted @ 2020-04-26 20:03 ToRapture 阅读(289) 评论(0) 推荐(0)
IPv4 headers
摘要：From: TCP/IP Illustrated, Volume 1: The Protocols. IHL The Internet Header Length (IHL) field is the number of 32-bit words in the IPv4 header, includ 阅读全文
posted @ 2020-04-24 17:13 ToRapture 阅读(296) 评论(0) 推荐(0)
Commands for IP
摘要：ifconfig https://linux.die.net/man/8/ifconfig Ifconfig is used to configure the kernel-resident network interfaces. It is used at boot time to set up 阅读全文
posted @ 2020-04-24 16:47 ToRapture 阅读(177) 评论(0) 推荐(0)
IP checksum
摘要：To do an experiment, first capture an IP packet, as we can see the checksum is 0xCAD7. Then we set the checksum field to 0, and calculate the checksum 阅读全文
posted @ 2020-04-23 14:22 ToRapture 阅读(263) 评论(0) 推荐(0)