ToRapture

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

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

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

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

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

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

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

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

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

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