icmp monitoring

ICMP is the so-called Internet Control Messaging Protocol (PROTOCOL), which is commonly used to transmit error messages and other information that should be noted in the network. ICMP is generally considered to be the same level as the IP protocol, IMCP packets are usually used by IP layer or higher level protocol (such as TCP or UDP), ICMP for the internet and o

Communication protocols for TCP/IP This section briefly introduces the internal structure of TCP/IP and lays the groundwork for discussing security issues related to the Internet. TCP/IP protocol groups are popular in part because they can be used on a wide variety of channels and underlying protocols such as T1 and X., Ethernet, and RS-232 serial interfaces. Specifically, the TCP/IP protocol is a set of protocol groups that includes the TCP protocol and IP protocol, the UDP (User Datagram Prot

Release date:Updated on: Affected Systems:Net-SNMP net-snmp Description:--------------------------------------------------------------------------------CVE (CAN) ID: CVE-2014-2284Net-SNMP is a free, open-source SNMP implementation, formerly called UCD-SNMP.Net-snmp-perl 5.7.2.1 earlier versions have security vulnerabilities in the implementation of ICMP-MIB, which can cause a crash after successful exploitation. This vulnerability only affects the Li

In linux, another method for Disabling icmp response-Linux Enterprise Application-Linux server application information is described below. If the value of the/proc/sys/net/ipv4/icmp_echo_ignore_all file is set to 0, ping is enabled. If the value is 1, no response is returned. Input: Echo 1> icmp_echo_ignore_all You can. General rules for ping: Echo 0> icmp_echo_ignore_all The restart of commands in shell will fail, so it should be run automatica

A previous piece of code that implements the ICMP protocol Ping tool with the raw socket RAW socketMyping.c#include #include#include#include#include#include#include#includestring.h>#include#include#include#includeinch.h>#include#include#include#defineIcmp_packet_size 16#defineTime_out_seconds 2unsigned ShortCal_chksum (unsigned Short*buf,intLen) {unsignedintsum =0; unsigned Shortret; while(Len >1) {sum+= *buf; BUF++; Len-=2; } if(1==Len) {Sum+ = (

1. ICMP packets are encapsulated in IP packets for transmission.Understanding this is very important for later programming. Figure 03 shows the structure of IP data packets: Figure 03: Structure of IP data packets Traditionally, IP data packets are divided into three parts:(1) data of the first 20 bytes in the IP data packet, that is, from [4-bit version] to [32-bit destination IP address] In Figure 03, this is called the IP address hea

ICMP spoofed source payload Tunneling I. Abstract Almost any device having IP stack with enabled ICMP can be usedBe a tunnel redirector. Ii. Description Let's imagine in net a hacker having his source server (s), destinationServer (d), and a IP-capable device-victim (V). S sends to V spoofed ICMPEcho Request packet containing IP Source Address of D, and the data inPayload. When V packet ing that packet, it

Scenario Description: Currently testing on windows, or testing on Linux, send UDP packets, although the destination port is unreachable, but did not return the ICMP message destination port unreachable situation, really do the UDP message delivery characteristics, there is no waiting, Although the Connect function is called, it has no effect, but we can imagine that the three-time handshake of TCP is the ConnectThe result of the function, but UDP call

ICMP Port unreachable authentication. 1. Preparationwindow to download the TFTP32 software and set the IP address of the server (window system IP ), and shut down windows firewall. As shown in the following:2,Ubuntu virtual machine, install tftp service, and install wireshark.sudo apt-get install TFTP3.Open Wireshark.Start the TFTP service and connect to window, Specify the 8000 port, this port number is not process in use , when need get file, Even

1. Code2. Compiling and Running 1. Go Language network programming: ICMP sample code ICMPTEST.GO1 Package Main2 3 Import (4 "FMT"5 "Net"6 "OS"7 "io"8 "bytes"9 )Ten One Func Main () { A ifLen (OS. Args)! =2 { -Fmt. Println ("Usage:", OS. args[0],"Host") -Os. Exit (0) the } -Service: = OS. args[1] - -Conn, Err: = Net. Dial ("ip4:icmp", service) + checkerror (Err) - + v

When doing an ICMP attack, the function that sends the packet is first written in Python.The data packet is Scapy module which needs to be installed first: Apt-get install Python-scapy" "Date:2014/12/3author:yssfunction:send packets from host to server with multithreading" "ImportThreading fromTimeImportSleep,ctime fromScapy.allImport*Num=1000#The number of the threadclassMyThread (Threading. Thread):def __init__(self,func,args,name="'): Threading. Th

Often encounter some problems is that the host is clearly online but the ping does not work, the other party may have opened the Forbidden Ping modeSometimes for security concerns, we need to disable ping for our Linux servers.Turn off ICMP protocol (ping-forbidden)echo "1" >/proc/sys/net/ipv4/icmp_echo_ignore_allCat/proc/sys/net/ipv4/icmp_echo_ignore_allOpen ICMP Protocol (disable ping)echo "0" >/proc/sys/

The ICMP redirection field, used by the router to notify the host of the optimal gateway to the target, is another vro on the data link. Purpose: 1. Verify redirection. 2. The impact of redirection on host data forwarding. 3. Disable the data forwarding process after redirection. Tutorial topology: Experiment Design: 1. R2, R3, R4, and R5 run the RIPv2 protocol. R1 disables the routing function and points the default gateway to R2. 2. the R4 and R5 i

This is a creation in Article, where the information may have evolved or changed. 1. Code 2. Compiling and Running 1. Go Language network programming: ICMP sample code ICMPTEST.GO 1 Package Main2 3 Import (4 "FMT"5 "Net"6 "OS"7 "io"8 "bytes"9 )Ten One Func Main () { A ifLen (OS. Args)! =2 { -Fmt. Println ("Usage:", OS. args[0],"Host") -Os. Exit (0) the } -Service: = OS. args[1] - -Conn, Err: = Net. Dial ("ip4:

Referenced from: http://blog.csdn.net/qq844352155/article/details/49700121How to turn off the ICMP echo function input in Linux: Echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all If you need a ping general input: Echo 0 >/proc/sys/net/ Ipv4/icmp_echo_ignore_all This command will fail after restarting, so it should be turned on automatically after the echo "Echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_all" >> /etc/rc.d/rc.localHow to turn off the

Zhang Yue's explanation of Visual C ++ network programming examples is very good, and his code is very beautiful! Books on network programming were abandoned for a long time. Pick up again in this period of time to fill in the deficiencies! This is an example of his first chapter. Simulate ping to send ICMP Packets: 1. program source code //////////////////////////////////////// //// // //////////////////////////////////////// //// // ////////

-shared key)" as above )" And enter the same content as the previous one. Click "Next". In the displayed window, click "add" to open the "IP Filter list" window. Click "add", click "Next", and set the source address to "I" Click "Next", set the target address to "any IP Address", click "Next", and select ICMP as the Protocol, now you can click "finish" and "close" to return. This You can see the created filter in the IP Filter list, select it, click "

This article describes the C + + computing ICMP header checksum method, share for everyone to reference. The specific implementation code is as follows: Copy Code code as follows: USHORT Checksum (ushort* buff, int nsize) { unsigned long cksum=0; Add the data to the cksum in Word units while (Nsize > 1) { Cksum + = *buff++; Nsize-= sizeof (USHORT); } If it is odd, extend the last word to two words, then add if (nsize) { Cksu

nameInput: National Provincial City Company Department mailbox host name 3 Submit a certificate request file to the CA serverCA Server Configuration: 192.168.4.551 Audit Certificate Request file issue digital certificate file: Command store directory file name2 issued a digital certificate file to the Web server3 Configure the Web site service to load the private key file and the digital certificate file at run time and restart the Web site service on the site server.4 Verify the configur

These monitors include host survival, disk space monitoring, load monitoring, process Count monitoring, and ip connection monitoring. (1) define the host configuration file hosts. cfgdefinehost {host_namecacti.comaliasnagiosserveraddress192.168.10.195contact_groupsadmin on the moni