How to catch a ICMP packet based on content.

[Errit Müller <ejm () jmac dk>]

Hi all

Can someone please help me create a rule that will alert if the ICMP packet
contains a special patter like "hallo" or something like that.
Have tryed the following but it did not work.
alert icmp any any -> any any (msg:"Hallo in packet"; content: "hallo";
reference:arachnids,449; classtype:attempted-recon; sid:467; rev:1;)

Brgds /Errit



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