Questions tagged [icmp]

ICMP stands for Internet Control Message Protocol. It is primarily used by the operating systems of networked computers to send error messages indicating service status.

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Unable to capture ICMP packets in wireshark

Ok I used yirsinia to launch a trunk port attack and right now the switch is recognizing my device as a trunk port. Except when I use wireshark to capture the packets from a different vlan (but right ...
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How is ARP reply generated from Windows 10? Sending ARP req from embedded device through ethernet port to windows10 on laptop

I want to send an ARP request using my embedded device through the ethernet cable to my laptop that has windows 10 on it. I want to receive an ARP reply from windows back to my embedded device through ...
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Can't access a host IP, but can traceroute and MTR

We are having an issue with a website hosting provider. All of our sites, and other people from home alike are able to access our website, however one of our two uplinks at one site is unable to ...
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Detect ICMP requests on a Windows 10 System

I'm looking for a way to detect ICMP requests (e.g. ping) on a Windows 10 System. Unfortunately it does not work with netstat, since ICMP doesn't depend on a port hence all other light weight tools ...
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DHCP Discover : why don't other hosts reply with ICMP 'port unreachable'

When a host sends a DHCP Discover (port 67, UDP), why don't all the hosts (except the DHCP server) reply with an ICMP 'port unreachable' message. This would cause a huge amount of useless data going ...
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ICMPv6_RA with ipv4 DNS server windows

I have a Windows 10 (20H1 with firewall disabled) computer connected to an AP. The AP sets the default DNS server to for example 6.6.6.6. The AP also sets the W10 internal IPv4 adress (thanks to DHCP) ...
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tracert ICMP TTL exceeded replies, the TTL number field

I have a base understanding of tracert and ICMP. I am stuck at somepoint, I runned tracert www.google.com on my windows 10 PC and monitored the traffic via WireShark. Whenever I get a a TTL exceeded ...
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Is it possible to send a PING without any data from a cisco router

Probably an odd question, I'm just working on a project where I'm using an application that only responds to pings without any data attached. If I ping from this program the Cisco router will respond ...
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Spectrum Router not allowing ICMP Echo Requests

I am currently trying to set up a server off of my Windows 10 PC, after lots of troubleshooting I have concluded that my router is blocking ICMP Echo requests (AKA Ping) from reaching my computer. ...
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Does ICMP use any processes from above layer 3?

I'm doing a project and have to describe the process of a ping from layer 7 to 1. Ping uses ICMP which is layer 3, so the data sits at under a layer 3 header. Does this mean any layers above that just ...
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Why are packets taking 64 hops to connect from my laptop to my laptop?

So, I'm pinging my laptop (from my laptop) expecting the TLL in the reports to be 128 (Because I'm on Windows 10), but I get this instead: Pinging [REDACTED] with 32 bytes of data: Reply from [...
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Do Linux (4.15.0-130) and Windows (10) treat ICMP differently?

While attempting to troubleshoot a Windows 10 machine with erratic network problems, I did a traceroute to a host and got somewhat different results from what I see on my Ubuntu 18.04 system with ...
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Traceroute/tracert fails to receive hops return information

I noticed that with some routers/gateways when I issue a traceroute or a tracert in a 'inner' computer the hops always fail with: request timed out can anybody clarify this? what information goes ...
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Windows ping to Any IP including 127.0.0.1 hangs, but internet works

I have weird behavior on my Windows 10 operating system. Any ping/tracert command hangs and nothing happens. I have never seen something like this before, and all i have found in the google aren't my ...
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ICMP DUP! packets (but only sometimes)

I have LibreNMS monitoring devices on my home network and it is logging duplicate ICMP packets on my network. Of the 30+ nodes being monitored, a few (3-4) exhibit this behavior. I can reproduce it ...
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ICMPv6 not reachable under Windows 10 while under Linux it is fine, why, how to fix?

I have just upgraded my ISP and it is finally IPv6-capable. Last year I had an ISP not capable, so... The only thing which does not seem to work under Windows only, is ICMPv6. Since it's an online ...
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Why does the ping programs print so slowly?

I have a raspberry pi as my gateway at 10.0.0.2 with some custom iptables rules for transparent proxy. My Netgear router is 10.0.0.1 with DHCP disabled. Internet access like browsing the web works ...
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Traceroute: destination IP-address returned for all but first hop. (Debian 9.11)

At some point in the past year, Traceroute behavior changed. Was working correctly prior. (Debian v9.11 Traceroute 1:2.1.0-2) Now, first traceroute result, my gateway, is correct, but all the ...
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Why does Node.js's ICMP listen get two responses when I ping localhost?

I am currently using the ICMP NPM package for developing a custom contribution node for node-red. After a couple of days' testing and making sure everything is okay before publishing I stumbled upon ...
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Get the Destination address from the ICMP header of a ping response

I want to perform a ping request or other fake request and print the whole response from the command line. Practically I'd like to see the same information I can see with Wireshark so that I can ...
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Can't ping anything on local network - general failure

When trying to ping another device within the local network (in same domain) it gives: General Failure. Sent = 4, Received = 0, Lost = 4 (100% loss). Huawei Matebook X Pro with latest version of ...
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Why can't I ping a computer in same network?

I have two computers on the same Wifi router. I want to ping the other one, it does not happen, I get a "destination host unreachable". Things I've already tried: I disabled the Firewall on both ...
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Does Windows Firewall block ICMP Timestamp Request (Type 13) by default?

This question is specifically related to the ICMPv4 Timestamp Request (Type 13) message. When I have Windows Firewall disabled I can send a Timestamp Request from the host and the client will receive ...
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Is really NMAP uses ping packets to consider Host discovery?

I run this command nmap -sn 192.168.0.2 for only Host discovery. And then I started wireshark to see what will going to happen. I thought It would send ICMP echo req, but the results was very ...
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No internet connection in cmd and msys2 when using USB Tethering and Wifi Hotspot on PdaNet+

I used my phone to connect laptop to the internet using PdaNet+. There are two options in PdaNet+ which are USB Tether and WiFi Direct Hotspot. I faced this problem for both the options. I can ...
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iptables - redirects to local network causes connectivity issues

I have 2 Debian routers and network set up like this: | | | Internet/Public IP | ---------- ROUTER A ---------- | | 10.97.0.1/16 | | 10.97.64.1/16 ...
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Allow VRRP on firewall

Deploying an HA redundant solution we use Keepalived with VRRP traffic and a virtual IP. So far I enabled VRRP traffic with the following command (working): sudo firewall-cmd --zone=dmz --add-rich-...
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Win10 allow incoming ICMPv6 - firewall is behaving weirdly

I finally got it working but I'm a bit confused still. Has anyone an idea why this approach (netsh) doesn't work on win10? technet forum netsh advfirewall firewall add rule name="ICMP Allow incoming ...
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IPv6 ping only possible when target machine pings back

I have a typical "a can ping b but b cannot ping a" problem. I use IPv6 for the ping. What is special in my case is that "b" can ping "a" immediately after "b" pings "a". After some trials, I realised ...
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Network Emulator Toolkit (NEWT) ICMP failing Windows 10

I am trying to use Microsoft's Network Emulator Toolkit to simulate poor network conditions, but it is failing to allow ICMP packets to pass through on Windows 10. I have tried disabling the firewall,...
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Why does the 2nd ARP request wait until the pings are over to show up?

This problem was presented to me by one of my professors because it only happened after switching from 100Mb cards to Gigabit NICs. The second arp request that comes from the computer being pinged (to ...
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2 votes
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Ping from VMware guest machine to the Ethernet interface of the Host machine

I want to ping from a VMware player guest machine to the Ethernet Interface of the host machine. The VMware guest machine has an adress in the VMWare Virtual Network:192.168.221.4 so I am able to ...
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Only allow pinging in one direction

How do I allow a ping from the first PC to a second one but block a ping from the second PC to the first one? I created this firewall rule on both Mikrotik routers: add action=accept chain=forward ...
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How can Ping not use a transport protocol?

I just learned that Ping uses ICMP directly, i.e. it bypasses the transport layer. How is that possible? Shouldn't an application (L5) use UDP or TCP in the transport layer (L4)? The way I know it is ...
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Spoofed Tunnel Route

What does it mean when tracert always shows a single long jump? The route below is always the same except the last hop goes directly to any destination IP address that I choose. And, how does the ...
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Required ICMP types for IPSec tunnel?

I have IPSec tunnel set up between 2 routers. It used to work fine, however recently I hardened policy in IDS and I started getting alerts about ICMP type 11 code 1 being sent from one router to ...
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Why is 32bytes the default ping size? Is it okay to use less?

I have a very large number of addresses I need to ping on a company network. I want to be as unobtrusive as possible. Would using ping 1.1.1.1 -l 1 reduce the strain on the network? Is the difference ...
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TCP application setting Don't Fragment (DF) Bit

I noticed that some TCP application is setting the DF (Don't Fragment) bit. My research seems to indicate that TCP wants to avoid fragmentation and instead want to adjust the segment size (MSS). ...
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Forwarding ICMP over a server without redirects

I need to test network characteristics like RTT in a network for example by using ICMP pings. This question is special since I want to force every packet over a server who needs to work like a router ...
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How do I get all of the websites visited from this packet?

I’m trying to find all the websites visited along with their IP srs and destination addresses but all I’m getting is a “No response found!”. PS: I am given the .pcap file so I can’t modify it. Also ...
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Mac receiving ICMP requests but not sending any replies

Why could my osx machine be receiving ICMP requests (that I'm sending), but not returning any replies? $ sudo tcpdump -nni any icmp tcpdump: data link type PKTAP tcpdump: verbose output suppressed, ...
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Constant ICMP echo request sequence number - no response

I wrote a program which (in an infinite loop) sends an ICMP echo request packet (the packet consists of IP header and ICMP header only), waits for some time and then receives an ICMP echo reply packet ...
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3 votes
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Virtualbox machine cannot ping its own public IP

I have a strange problem. I have a bridged network adapter on my virtualbox machine (Kali Linux) - with assigned IP address with my local LAN pool (192.168.0.22) and I can ping e.g google.com (DNS ...
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Unable to send ping from host A via B to C

There is a network of three computer. Problem: Host A (192.168.1.1) can send ping to host B (10.10.0.5, also 192.168.1.2), but can not to send C (10.10.0.6, 10.10.0.7). Host A say: "10.10.0.6 = ...
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Why is address family mandatory when using icmp with pf?

there. I wasn't able to find the answer for this question: when creating an ICMP pf rule, I must tell it's inet or inet6 address family; I would like to know why, as proto icmp is for inet and proto ...
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Zabbix ICMP Template Macro

I am trying to use a Macro in the ICMP Template to have more flexibilty for my hosts. In my head I have everything set up correctly, In my trigger view I can see the host is set to alarm warning only ...
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Get ICMP packet payload

I know, that I can send a custom payload with -p param in hex format, like ping -p DEADBEAF 8.8.8.8 Just curious, does the server could answer with payload too? If yes, how can I show it in terminal? ...
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icmpping in Zabbix, one item multiple server

I want to check availability of 16 machines with a single simple check item in zabbix, how can I do that?
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Tracert shows unlisted IP adress. Can't ping or tracert in LAN

So this issue is boggling my mind right now. I have the following setup: device A - my desktop computer, Win 7, wired ethernet connection to router (Fritzbox 7490). device B - my laptop computer, ...
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Cannot ping, but can connect to the internet - Windows 8

I am not able to ping google.com or any other host when connected to ethernet (request timed out), however I do have network connectivity. When I connect to Wi-Fi on the same network, I am able to ...
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