Me 3... How is this related to Palo Alto. Just for fun. Always remember the OSI model. Start at Layer 1 and work your way up. I would first be looking a physical layer issue. You mentioned 40Gb optical. I've been bitten by dirty optics more times than I can count. Start there. As the previous reply states, have you checked for wireless interference? Once these are cleared up, remember that ICMP is a very low priority protocol. Some Cisco devices will even start dropping them if they receive too many within a given time frame. Do you even have a Palo in this equation?
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