Thank you for your help. Yes, it works after I redef the capture_filters.
Great, glad to hear it.
How about the icmp_sent event handler? Should the icmp_sent event handler see
all kinds of icmp packets?
If you look in icmp.bro you'll see that it already sets a capture_filters
entry, so yes, it should see all kinds of ICMP packets (at least, those
for which the event engine generates events).