[Snort-users] Snort not alerting although tcpdump shows packet

Gaurav Srivastava gaurav.srivastava7 at ...11827...
Fri Apr 17 07:45:55 EDT 2015

Dear all,

I have a strange issue. I am running snort to observe traffic mirrored from
another VM.
But Snort is not alerting. To verify whether the packets are received or
not I did a tcpdump using following command

sudo tcpdump -w icmp.pcap -i eth0 icmp

And when I read the file using snort using below command:

snort -r icmp.pcap

It displays the ICMP packet logs. But the alert was not generated when
snort was running.

Please suggest. I am stuck here.

Thanks and Regards,
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