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bot47
Asked: 2012-02-18 02:28:34 +0800 CST

Why Doesn't Ping Show RTT?

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I'm on OS X 10.7 and just found out, the

ping -s 10 host

does not work as expected. Its output does not contain the round trip time:

PING host (IP): 10 data bytes
18 bytes from IP: icmp_seq=0 ttl=248
18 bytes from IP: icmp_seq=1 ttl=248
^C
--- host ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss

It works if -s's value is 16 and above. I also experienced this on Linux, but with a smaller value. I read man ping, but it does not mention a restriction.

ping

1 Answers

  1. Best Answer

    With packet sizes that small, there's not enough room in the packet to hold the timestamp.

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