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.

learn more… | top users | synonyms

1
vote
2answers
320 views

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 ...
0
votes
2answers
35 views

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 ...
2
votes
1answer
519 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 ...
1
vote
1answer
265 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 ...
1
vote
1answer
649 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. ...
0
votes
1answer
102 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 ...
0
votes
1answer
24 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 ...
0
votes
1answer
397 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 ...
0
votes
1answer
698 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 ...
2
votes
0answers
932 views

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 ...
1
vote
0answers
1k 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 ...
0
votes
0answers
5 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 ...
0
votes
0answers
36 views

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 ...
0
votes
0answers
31 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 ?
0
votes
0answers
35 views

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, ...
0
votes
0answers
74 views

Using fping to find convergence times

I am trying to use fping command (fping -A -c 10 -D -e -p 500 < target) in order to determine the convergence time of a changing route; in other words, the amount of time between successful pings ...
0
votes
0answers
24 views

Linux: Can user applications generate icmp messages?

I am using TOR and setting up a transparant proxy depending on users. I had trouble to constrain ICMP messages on UID. But I found an explanation for that on server fault. For the sake of privacy: is ...
0
votes
0answers
30 views

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 ...
0
votes
0answers
235 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 ...
0
votes
0answers
68 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 ...
0
votes
0answers
88 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 :- ...