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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Batch Capture incoming Netstat IPs as variable

I'm trying to figure out if there is a way I can capture (and if possible, log) the ip addresses displayed from 'netstat' command. I'm trying to make a script that waits for a ping from a specific ...
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What does this hex value mean in source column within NETMON?

I am using NETMON to try and figure out why my local network is running so slow. I think it may be related to a system logged into it, but in order to not draw attention to my task i have been ...
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57 views

Varying TTL on LAN

I've got a wireless router behind a router-modem. If I ping my router-modem (TWO hops), all seems well : robut@host:~$ ping 172.X.X.36 PING 172.X.X.36 (172.X.X.36) 56(84) bytes of data. 64 bytes ...
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759 views

SSH and PWNAT for SSH Connection Between Two Separate NATs

Is it possible to use pwnat and SSH to establish a "peer-to-peer" SSH connection between two machines that are behind two separate firewalls/NATs? If this is possible, what are the steps that would ...
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1answer
758 views

Why am I having trouble using ptunnel to connect to machine in DMZ from WAN?

I'm trying to have a play with ptunnel, I have it running (listening) on my raspberry pi in my DMZ and I can connect to it from my LAN and tunnel ssh over it, but I can't get it to work over my LAN. ...
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1answer
327 views

OS X: how to make it reply to “ICMP time stamp query”?

As per another question, I'm using hping--icmp-ts to send the ICMP time stamp requests to debug asymmetric routes. It seems like my OpenBSD box generates time stamp replies by default without any ...
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156 views

Locating and pinging a satellite

I want to ping a satellite, or ping some far off computer and know for sure that somewhere in the traceroute is a satellite hop I know that if I ping a computer in , say, australia (i am in the UK) ...
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218 views

Block ICMP flood from a specific IP with pf

I'm getting a lot of ICMP throttle messages in my system.log: Apr 11 20:45:28 kernel[0]: Limiting icmp unreach response from 1054 to 250 packets per second Apr 11 20:45:29 kernel[0]: Limiting icmp ...
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28 views

How to create ICMP Code-3 error

I made lots of search but couldn't find useful info about how create ICMP Code-3 (dest. unreachable) error and capture it with Wireshark. I tried to ping a closed port in Linux machine and also used ...
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594 views

Make ICMP exempt from IPSec protection

I'm reading a reference book on Microsoft DirectAccess. It contains the quote: To use Ping as a troubleshooting tool, ensure that Internet Control Message Protocol (ICMP) is exempt from IPSec ...
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777 views

ICMP Tunnelling IP vs Tunnelling TCP?

Could someone please explain the difference between tunnelling IP data using ICMP packets and tunnelling TCP data via ICMP? Obviously I know this is going to be something relevant to the different ...
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Firewall blocks ICMP even with Allow rules, even when disbled

Sometime early October (right after update Tuesday???). My Window 7 home machine stopped responding to anything incoming. Effectively breaking iTunes, Sonos, TiVo Desktop, RDP etc. But all those ...
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ICMP flood with ping working only one time

my problem is simple: The first time I made a flooding ping to a fake ip on my network (for testing if someone is on promisc mode), it works perfectly: $ping -f 192.168.1.10 After perfoming this, ...
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2k views

udp client sending ICMP “port unreachable” when receiveing messages from the server

(Note: I moved this question from StackOverflow, because it's to be considered off-topic there, better fits here, and still unsolved) I have a udp client using luasocket, basically doing this (with a ...
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How to use socket or raw socket to sniff all icmpv6 nd packets?

I am working on NDP(neighbor discover protocol) on a router host and the ndp proxy functions to advertise neighbors behind the same router host. But currently, got stuck with the socket to sniff ...
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23 views

How do PING responses disabled from different subnets?

I found that: I can ping my Windows box A from another computer B in the same subnet. This implies, that echo server is running. I can open remote desktop on A from another computer C in another ...
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192 views

Why can't i ping my iPad from the PC?

I have an iPad 2 with iOs 8.3 and i have a PC with Win 7. And i have a trouble: the PC can't ping the iPad. 'ping 192.168.0.41' says 'destination host unreachable' But my gate device, ZTE F660 can ...
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56 views

Traceroute behind a Carrier-Grade NAT (IP address 100.64.0.0/10)

Is it possibile that a Carrier-Grade NAT blocks all incoming ICMP messages? Trying a traceroute from an IP address belonging to the range 100.64.0.0/10 it doesn't detect any hop, neither the first ...
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414 views

how to stop PC from sending ICMP of “Destination Unreachable(host administratively prohibited)”

I'm doing some experiments and measurements. I send some random TCP packets to a laptop(with fedora system), that laptop reacts by sending ICMP packets of type 3 and code 10, which means Destination ...
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75 views

traceroute shows destination host only

I run tracert to a target in our company network and got the following result (ip and names are mangled) $ tracert target.example.com Tracing route to target.example.com [192.168.10.1] over a ...
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117 views

Firewalld Zones and ICMP

How are the zones in firewalld configured w.r.t ICMP packets? and do they act differently for interfaces and sources? [Original Q from serverfault] 1. How firewalld route ICMP packets? I would ...
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How to configure Windows XP/windows 7 to support icmpv6 redirection?

  I construct an icmpv6 redirection packet. When I send it to Linux, it works well. Then I modify its destination ip and mac address and send it to the corresponding windows XP/7 system, but windows ...
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222 views

Can't ping Windows 2012 Server

File and Printer Sharing (Echo request - ICMP v4 and ICMP v6) is enabled in Inbound Rules, but still I can't ping server. I even turn off my Windows Firewall. What is the reason ?
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No response to ping of specific size

ping <anything> -s 473 does not receive a single reply. ping <anything> -s 476 works, as well as ping <anything> -s 472 but no size inbetween. What could be the reasons for ...
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250 views

Wireshark Capture Filter

I am new to wireshark and I am trying to capture an ICMP packet over 802.11g, I am using windows and pingplotter. The issue is that on wireshark capture I am not getting any ICMP packets no matter how ...
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94 views

ICMP over protected wifi

I am looking at sending a single ICMP message to a server and recieving one single ICMP reply. The question that I'm trying to answere is if it is possible to send an ICMP ping over a wifi that i do ...
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91 views

Windows ping - 'ignores' ping replies

I'm using Window's built-in ping command to test connectivity with my Ethernet device ( a enc28j60 Ethernet controller and an avr atmega), but Windows ignores replies. Screenshots :- ...