BQM & Firewall

Do the Pings from the BQM to the router come from a specific IP address? If so is it allowable to know what it is?

Reason I ask is that if possible, I want to set up some firewall rules to allow ICMP requests from the BQM Firebrick but drop packets from any others.

Its prior to coffee, but think its pingbox1.thinkbroadband.com

In reply to a post by MrSaffron:

Its prior to coffee, but think its pingbox1.thinkbroadband.com

Thanks Mr S. Got to go out now but I'll give it a try later on.