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# tcpdump

#### listen for icmp traffic
    tcpdump -i eth0 icmp

#### check a port
    tcpdump -i any port 25
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9