traceroute example

address double.The last reason is also the main reason, the IP header left the option space is limited, cannot hold the most current path.Traceroute Program principleThe Traceroute program uses the ICMP message and the TTL field in the IP header (the life cycle).Each router that processes datagrams subtracts 1 of the TTL value or subtracts the number of seconds the datagram stays in the router. Since most routers forward datagrams have a delay of les

Ping programThe ping program was written by Mike Muuss to test whether another host is available.The program sends an ICMP echo request message to the main clause and waits for an ICMP echo reply to be returned.The ping program can also detect the return time of this hostTraceroute ProgramThe Traceroute program is a handy tool to explore the TCP/IP protocol in more depthThe Traceroute program allows us to s

return all information to the sender. Most Ping SERVER implementations return the received RR list, but this doubles the recorded IP address. The last reason is also the main reason. The IP Address Header has limited space for options and cannot store most of the current paths. Traceroute program principle The Traceroute program uses the TTL field (TTL) in the ICMP packet and IP header ). Each vro that pro

Reprint Please note: @ small Wuyi: http://www.cnblogs/xiaowuyi After scapy is installed (the first two notes are described), run sudo scapy in linux.1. Simple sending package 1. send () sends data packets on the third layer, but does not receive data packets. For example: >>> send(IP(dst=,ttl=)/ packets. This is equivalent to pinging Baidu, ttl = 1 2. sendp (), which sends data packets on the second layer, also has no receiving function. For

The Traceroute program allows us to see the routes that the IP datagram passes from one host to another, and can use the IP Source Station routing option.Traceroute the reason for replacing IP RR 1 not all routers support the IP RR option, while the Traceroute program does not require any special or optional functionality from the intermediate routers. 2 record routing is generally a one-way option. The sen

traceroute the principle of:1.traceroute host to be Trace Host Send UDP The destination port is a port with a large number (for example, 33434 Port)2. First package ttl= 1 Span style= "Font-family:simsun;" lang= "ZH-CN" xml:lang= "ZH-CN", dport=33434 ; future packet ttl 1 3. How to determine that you have reached your destination,general destinations

Label: style OS SP data on problem time ef Basic traceroute commands This command is used to test the network layer connectivity between two TCP/IP systems and display each hop address in the transmission path, also known as path tracing. If the traceroute command is successfully tested, we can observe a complete communication path between the source host and the target host, and clearly observe each hop in

ICMP Internet Control Message Protocolis generally considered an integral part of the IP layer and is generally used by the IP layer or higher (TCP, UDP).The ICMP message is transmitted inside the IP datagram.The format of the ICMP message is as follows:The first 4 bytes of the message are the same: 8bit type, 8bit code, 16bit test and.The ICMP packets have different message types, and the different types are determined by the 8bit type and the 8bit code together. There may be more than one code

By traceroute we can know what path the information from your computer to the other end of the Internet host is walking. Of course, each time a packet arrives at a similar destination (destination) by a similar starting point (source), the path may be different, but basically the route is the same.Traceroute measures how long it takes to send a small packet to the destination device until it returns. Each device on a path is measured 3 times

echo and ICMP echo reply packets to detect the presence of the host, so the process of pinging is simple: sending ICMP echo packets----> receiving ICMP Echo reply packets)Ping gives us a chance to see the host's route to the destination host. This is because the ping request datagram for ICMP is reported by the router to put its own IP in the datagram every time it passes through a router. The destination host copies the IP list back to the host in response to the ICMP packet. However, in any c

Python's traceroute feature makes it easy to implement with Scapy templates, and it's intuitive to output routed images.Here is a description of the code that modifies the Python automated operations: technology and best practices.#!/usr/bin/evnpython#-*-coding:utf-8-*-importtimeimportlogging,warningsimport Subprocessimportsocket#eclipse Pydev prompt Unresolve, but normal operation fromscapy.allimport traceroute