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Questions tagged [icmp]

Internet Control Message Protocol, designed for control and diagnostic messages. Used by common diagnostic tools like ping or traceroute.

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check ethernet connection periodically android

I'm trying to periodically check the network connection. However, this is for a Chinese Android Mini PC, not a tablet or smartphone. I'm using an ethernet to usb adapter instead of Wi-Fi. First I used a broadcastreceiver class: public class…
Armadillo
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Checksum calculation issue for ICMPv6 using Asio Boost

I have used the ICMP example provided in the ASIO documentation to create a simple ping utility. However, the example covers IPv4 only and I have a hard time to make it work with IPv6. Upgrading the ICMP header class to support IPv6 requires a…
Marcus Frenkel
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recvfrom not returning -1 after signal

I am writing a ping program using raw sockets but recvfrom is not returning -1 with EINTR even though a SIGALRM is being handled.This SIGALRM is produced by my alarm(1).I want recvfrom to return so that i can decide that the packet has indeed been…
Sr1n4th
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localhost icmp packet found in capture file: why?

Here's my tcpdump filter (ip[8] is the IP ttl field and icmp[0]=11 corresponds to time-exceeded ICMP messages): (ip and ip[8]=2 and src host $myIPAddress) or (icmp and dst host $myIPAddress and icmp[0]=11) And here's what I found in the capture…
Ricky Robinson
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Dont fragment flag for IPv6 packets in Linux using C++

I can not set the "don't fragment" flag for the IPv6/ICMPv6 packets. I am doing PMTUD and I want to force the router to drop packets bigger then the MTU. Using setsockopt with IPV6_MTU_DISCOVER is not working. int on = IPV6_PMTUDISC_DO; // tried…
Matej Koleják
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struct: unpack Requires String Argument of Length 16

For my Computer Networking class, I'm trying to implement Traceroute using raw sockets with the ICMP protocol. I need to build a packet and then unpack the response packet using the Python struct class. Here is the code for building the…
Matt
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Is there a way to make an android device answer to icmp pings addressed to the broadcast address?

I would like to programatically make my device answer to broadcast pings (i.e pinging 192.178.1.255) while connected to a wifi network. Is there a way i can do that ? Maybe a listener that will ping back, or a flag to set somewhere? Thanks.
Intrepidd
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how to get icmp on udp socket on UNIX

Getting raw sockets requires root privilege, and tcp/udp doesn't have it, so I need to know how to get a udp socket and fetch icmp data. The programming language is C and the OS is BSD-like. (In other words I want to write a ping without root…
ziggear
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Block ping in Windows Server 2008 R2

I have deployed my Asp.Net web application on Windows Server 2008 R2 , and I want to block all ping requests to this server without effecting my application . Thanks in advance
Satinder singh
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How to tell if computer is on and operating on a network

I have a computer that's configured for magic WOL packets, so the adapter will respond to ICMP. Pinging the computer doesn't seem like it'd provide a lot of useful information since it'll always respond even while off. The machine runs Windows 7 and…
chaz
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Responsing on ICMP in select

The basic code sequence I'm interesting for is (pseudocode) sendto(some host); // host may be unreachable for now which is normal ... if(select(readfs, timeout)) // there are some data to read recvfrom(); Since Win2000, ICMP packet, which is sent…
Yury
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Limiting ICMP echo replies when creating a PING program

I was writing a multithreaded ping program. I created rawsockets on each thread (for each IP) and sent ICMP Echo Request to each using sendto() and then I did recvfrom() in each thread. I am getting messages from IPs in various sockets(like if I had…
Gambit
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Macos: ping: sendto: Socket is not connected

Using ping on Macos [Big Sur 11.01], I'm getting this error message: ping: sendto: Socket is not connected What is likely to be the problem? What can I do to prevent it? The call from bash is: ping -t2 -c1 time.com
Peter Brooks
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C# - Ping server with ICMP disabled

I am trying to ping a series of servers frequently using the PingReply class. Most of the time this is fine, but other times I get failed pings. I'm guessing this has something to do with ICMP being disabled on the remote server(s). Is there any…
user
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socket connection "Operation not permitted" error even root with boost/pinger.cpp

I try to connect to socket to send icmp echo request with modified boost/pinger.cpp return Operation not permitted even I am root user. In Ubuntu 20.04, I am runnig the program with sudo there is no problem it works. But if I run at ARM with poky OS…
furkan
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