recently i have seen a debug output from cisco PIX 525 (IOS 6.3) of very large traffic with an ICMP echo-request to a single dest address sourced from some addresses from the same subnet.
-source addresses are from the same subnet of 10.x.1.0/24(some solaris machines on one of the PIX interface) and dest address is 0.0.0.5
-debug command used on PIX: debug icmp trace
-sample output line: ICMP echo-request from (PIX intf name):10.x.1.x to 0.0.0.5
what could be the reason for this traffic?