Ethical Hacking

Learn to find vulnerabilities before the bad guys do! Gain real world hands on hacking experience in our state of the art hacking lab. Course designed and taught by expert instructors with years of penetration testing experience. 12 student maximum in every class. Certification attempt included in every package.
Computer Forensics Training at InfoSec Institute

Gain the in-demand skills of a certified computer examiner, learn to recover trace data left behind by fraud, theft, and cybercrime perpetrators. Discover the source of computer crime and abuse at your organization so that it never happens again. All of our class sizes are guaranteed to be 12 students or less to facilitate one-on-one interaction with one of our expert instructors.




Network Security Security-Basics
[Top] [All Lists]

Re: Removing ping/icmp from a network

Subject: Re: Removing ping/icmp from a network
Date: Tue, 25 Mar 2008 14:12:37 -0400
On Tue, Mar 25, 2008 at 12:56 PM, Hopke, Greg <GHopke@libertymgt.com> wrote:
Is ICMP on a LAN insecure?

 I could see lowing it through a firewall or from trusted to non-trusted.

 Greg


Within a trusted LAN, it is completely secure.  As ICMP is handled
directly by the operating system, there have been a few exploits
discovered that can crash a box with a malicious ICMP packet.
However, discovered flaws are not only very old, but have been fixed
on just about every OS.  ICMP is a twenty year old protocol and is
very reliable and helpful.  I wouldn't allow untrust to trust ICMP
outside the firewall, but trust to trust and trust to untrust would be
just fine in most cases.


-- 
Mark Owen

<Prev in Thread] Current Thread [Next in Thread>