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| Subject: | Re: Removing ping/icmp from a network |
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| 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
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