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

0
votes
2answers
113 views

Multiple ICMP destination unreachable messages

I'm load testing some web services hosted on IIS7. The web services make network calls to underlying services in response to client requests. The client requests are simple HTTP requests but the ...
0
votes
2answers
263 views

Linux not sending ICMP with iptables `--reject-with`

Using iptables I am trying to reject packets (I want to return an ICMP message). iptables -A FORWARD [...] -j REJECT --reject-with icmp-port-unreach The packets are dropped but using tcpdump I can ...
0
votes
1answer
91 views

How can I proxy ICMP requests?

I have a ubuntu server that receives many ping requests from various other servers in the network. I would like to be able to proxy these requests. Using iptable rules I can see how to DROP or ACCEPT ...
0
votes
1answer
241 views

Ubuntu stops responding to ping from random clients

I got a ubuntu server running redmine from apache. My clients, can access redmine, but stops responding random, and other clients, can browse redmine fine, when the client with the problem cant ...
0
votes
1answer
147 views

What is causing ping sweep?

I am spotting ping sweeps on our firewall log originating from our Windows 2003 SP2 x64 server. The traffic shows sequential pings sent to private ranges only. Eg: 192.168.1.1 192.168.1.2 192.168.1.3 ...
0
votes
1answer
149 views

No transmission via IP

I'm using netstat on Win XP to check protocol transmission details for TCP, IP, and ICMP. There is transmission only in TCP. No transmission in ICMP is understandable since it's for errors and I ...
3
votes
0answers
661 views

Forwarding traffic from TUN device (C++ backend) to the default gateway

The following problem is just a piece of the bigger solution I have a problem with. All other elements seem working so far, so I'll try to describe very small piece which I have problem with. I've ...
2
votes
0answers
40 views

How can I test an ICMP Re-direct message?

I want to test whether my linux machine is actually accepting ICMP re-direct message and updating the entry in routing table.This is what i have done so far to achieve the same. Simulated a ICMP ...
2
votes
0answers
222 views

ICMP Redirect Theory VS. Application

I'm trying to watch ICMP redirects in a lab using Cisco Packet Tracer (version 5.3.2) and I'm not seeing them, which leads me to believe that either my lab configuration isn't correct or my ...
1
vote
0answers
216 views

Linux MIPS box: ICMP (ping) works, but TCP does not - how to fix it?

I'm trying to set up MIPS Linux box network. Here is it's configuration: ~ # ifconfig eth0 Link encap:Ethernet HWaddr CC:5D:4E:FF:45:7F inet addr:192.168.0.2 Bcast:192.168.0.255 ...
1
vote
0answers
152 views

Only ICMP traffic allowed inbound on ISA Server 2006

I have recently set up a connection to a remote site. The connection between the sites is done at the ISP level (ie, this is not a B2B tunnel on ISA). I'm fairly lightweight in the networking realm, ...
1
vote
0answers
127 views

Disable response from outside interface on ASA 5505 while allowing ping (and response from outside) on the inside interface?

On the ASA 5505 How do I allow icmp requests out (and responses back in) while not allowing a response from the outside interface when pinged.
1
vote
0answers
840 views

Why is my CentOS box rejecting some (but not all) ICMP ping requests from the same remote host?

CentOS 4.x I've got several old CentOS 4.x systems and have configured iptables to allow ICMP traffic. Originally, I had an iptables rule that looked like: -A RH-Firewall-1-INPUT -p icmp ...
1
vote
0answers
426 views

Where is HP Procurve route type “ICMP” coming from?

I've got the following test network: Architecture: edge_a: 192.168.e.1 [edge vlan] (edge switch, no acl) [admin vlan] 192.168.m.1/24 core: 192.168.m.2/24 [admin vlan] (core router, yes acl) ...
0
votes
0answers
113 views

Wierd traceroute / ICMP issues on Juniper SRX 210BE

I recently acquired Juniper SRX 210BE; until now I've been using Cisco ASA 5505 but I really want to switch over to Juniper world (big FreeBSD fan and all that). I've got FTTC (fiber to the cabnet) ...
0
votes
0answers
68 views

What is causing this seemingly excessive ICMP traffic?

This seems to occur when I initiate a connection to an IP that I haven't previously before. Is this a botnet trying to say hi to his friends? As you can see I have an ip filter set in this image, ...
0
votes
0answers
123 views

No connectivity between aliased IP networks of different subnet

I am trying to set up two virtual networks(different subnets) to test site to site VPN in my Laptop. My host OS is Debian Wheezy and i am using Virtual box to virtualise my setup. I have two aliased ...
0
votes
0answers
217 views

What does given filed mean in netstat -s on Linux

I am analyzing the the output of netstat -s and wanted to know what "input ICMP message failed" is meant for ,below is output of netstat -s Icmp: 643 ICMP messages received 0 input ICMP ...
0
votes
0answers
149 views

Multihoming, NAT and ICMP

My router is the default gateway of a LAN and is multihomed. ISP2 is used for HTTP, HTTPS and ISP1, the default gateway of the default routing table, for the rest of the traffic. Similar questions ...
0
votes
0answers
224 views

ICMP ping one way only?

I have 2 W7 hosts (may be others, I haven't checked yet) that are on the network, and can ping the domain controller. They can also ping each other. Yet when I'm on the server, the ping request ...