CSMARS reporting ICMP traffic between hosts and Exchange Server

We recently added a CSMARS box to our infrastructure so it could correlate and report on our 4260's alerts. I've noticed that CSMARS is reporting on ICMP's from multiple hosts within our network sending ICMP packets to our Exchange server. The total amounts of packets are between 15 and 30 and then the ICMP's from the specific clients stop.
I know that Windows XP clients will send ICMP traffic to domain controllers in order to test connectivity and I'm wondering if we're seeing the same occurrence with our Exchange clients.
Thanks,
Javier

Hi, the signature that is firing is ICMP Flood
Signature ID: 2152/0. According to Cisco's site this signature should not fire under normal circumstances. However, when we first setup the IPS sensor it would deny all vpn users' access to our exchange server as the Win Nuke signature kept firing. Of course this was a false positive.
However, once I tweaked the CSMARS rule a bit the noise calmed down and it reported on two hosts that were trying to send ICMP floods to Google.

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