Four network test tools built into the system

As a network management, will certainly encounter a variety of network problems, but a huge network, nodes are sometimes distributed around the entire building or even several or several different places, such as no network testing tools that difficult to imagine. Of course there must be special testing tools, usually hardware, and the price is quite expensive, a small or medium-sized business or family is generally not likely to spend so much money to solve these network failures. In fact, in my operating system also built some very useful software network testing tools, if it can be used properly, and grasp a certain test skills can generally meet the general needs, and some even hackers as a hacker tool! These tools, though not a professional hacker tool, In fact, there are many hacker tool software is based on these built-in network test software and compiled, rewritten. Here are a few examples of these tools combined with a brief introduction, I hope that those who have not mastered these tools have some help friends!

A, Ping

Believe that people who play the network will be "Ping" this command to know or heard. The ping command is an integrated, TCP/IP protocol-specific test tool in windows9x/nt that is used to see if a host on the network is working, and it achieves its purpose by sending an ICMP Echo_request packet to the host for testing. General application of the TCP/IP protocol of the local or wide area network, whether you are only a few computers within the home, office LAN, or campus network, corporate network or even Internet network, when clients and clients do not normally access or the work of the Internet has a variety of unstable situations, We suggest that you must first try ping This command to test the network communication is normal, most of the time can be effective.

Syntax format for 1.Ping commands

The ping command looks like a small tool, but it has a lot of parameters, to fully master its use method is really not easy, to achieve skilled use is difficult to add difficult, but anyway we have to look at its true colors, first of all, we still from the most basic command format to start it!

The full format of the ping command is as follows:

ping [-t] [-a] [-N Count] [-l-length] [-f] [-i TTL] [-v TOS] [R Count] [s count] [[-j-host list] | [k Host-list]] [-w timeout] Destination-list

From this command to see how complex it is, the ping command itself is followed by its execution parameters, now give a detailed explanation of its parameters!

-t-has this parameter, when you ping a host system will not stop running ping This command, until you press CONTROL-C.

-a-the NetBIOS host name of the host, if you want to know the name of the computer you ping, you should add this parameter, usually the first line after the ping command is displayed.

-N count-defines the number of test packages that are emitted to test, with a default value of 4. By using this command, you can define the number of messages you send, which is helpful for measuring the speed of your network, for example, I would like to test the average time to send 20 packets back, the fastest time, and the slowest time can be learned by executing commands with this parameter.

-L length-defines the packet size of the sent buffer and, by default, Windows Ping sends a packet size of 32byt, which can be defined by itself, but there is a limit to the maximum number of 65500byt to be sent, The other side is likely to be too large for the packet to panic, so Microsoft to resolve this security vulnerability so that the ping packet size limit.

-f-send the "Do not Fragment" flag in the packet, generally you send packets will be sent to each other through the routing segment, plus this parameter route will not be further segmented processing.

-I ttl-specifies the time that the TTL value stays in the other's system, and this parameter also helps you check the network's operation.

-V tos-Sets the service Type field to the value specified by TOS.