ICMP

The VPN-only port can respond to certain ICMP requests, such as ping and traceroute.

VPNOnly 2001

The VPN-only port can respond to certain ICMP requests, such as ping and traceroute.

VPN-Only Port Guidelines 2001

Obviously they just filter out ICMP ECHOs to save bandwidth and processing power.

Su.pr Shrinks And Shares Your Long URLs | Lifehacker Australia 2009

FAFG recently started a programme to get saliva and blood samples from families of the missing, similar to an effort conducted by the International Commission on Missing Persons, ICMP, in Bosnia.

Learning to Document the Victims of Conflicts IWPR 2008

In this analysis, using ICMP & ping command, they have extracted the IP Address & TTL (Time to leave) of the website to be attacked; TTL tells the type of operating system residing at server end.

A Research made on Web Vulnerabilities by Sedulity Team 2008

It works by sending ICMP “echo request?? packets to the target host and listening for replies (ICMP “echo response?? packets).

Do-It-Yourself Search Engine Optimization Guide « Lorelle on WordPress 2006

By blocking the ICMP, thereby, blocking the arrival of ICMP packets on the website server, by which more than 60% of the attacks can be neutralized.

A Research made on Web Vulnerabilities by Sedulity Team 2008

The purpose of this research paper is to provide information and defense mechanism against the denial of service (DOS) attacks & distributed denial of service attacks (DDOS), using internet control message protocol (ICMP).

A Research made on Web Vulnerabilities by Sedulity Team 2008

When I bring up a router, one of the first things I do is to remove the ICMP echo response.

Floods, attacks and misdirections « Climate Audit 2007

The traceroute program reports the IP addresses of the routers/computers that send back a “TTL expired” ICMP packet.

Firedoglake » Clinton Rules 2006