size of packet icmp with netstat TX

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http://serverfault.com – I am confused with the size of packet icmp. I just did a simple initial netstat, where for eth0 : TX-OK = 485 after 1 ping message is send, again I see in netstat TX-OK = 488 So, I just want to know how does the TX actually intepret the icmp packet is counted? I thought with 1 ping , then the TX-OK will be 486? *edit : 1 PING is 64 bytes. so howcome number of pacet in TX differs only 3 ? (so 1 packet is counted as 21,3 bytes ?) (HowTos)