Figure 4: ICMP statistics on UNIX

# netstat -s
...
icmp:
        150 calls to generate an ICMP error message
        0 errors not generated because old message was ICMP
        0 errors not generated 'cuz old message was broadcast
        Output histogram:
                echo reply: 130
                destination unreachable: 150
        0 messages with bad code fields
        0 messages < minimum length
        0 messages with a bad checksum
        0 messages with bad length
        Input histogram:
                echo reply: 160
                destination unreachable: 57
                routing redirect: 13
                echo: 130
                #9: 7254
                address mask reply: 6
130 responses sent