Date: Mon, 21 Jun 2004 08:26:17 -0400 From: epilogue@allstream.net To: adrian kok <adriankok2000@yahoo.com.hk> Cc: questions@freebsd.org Subject: ping command question Message-ID: <20040621082617.4a0a5b48@localhost> In-Reply-To: <20040621005632.5241.qmail@web21204.mail.yahoo.com> References: <20040621005632.5241.qmail@web21204.mail.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, 21 Jun 2004 08:56:32 +0800 (CST)
adrian kok <adriankok2000@yahoo.com.hk> wrote:
> Hi all
>
> Do you know why the command "ping" in unix and window
> is different?
>
Not if and how they are different. Perhaps someone else can help out
here...
> I start from one ISP to ping other ISP
>
> 1/ If the following result from window, it is good or
> not?
> lost = 7 within 3 thousand packets
>
In your results, you'll notice that you lost 7 packets out of over 3500,
which translates to a loss of 0%. In internetworking, it is
generally normal for the odd packet to get lost along the way (for a
variety of reasons). Simply analysing the loss rate is not enough to know
if your connection is behaving as it should (1), nor does it help to
pinpoint where a problem may be (2).
(1) Unless you know the expected latency of the path you're testing,
you're not going to get very far. You'll have to read up (books/google) on
networking latencies in order to get a better handle on this.
(2) Unless you're pinging each hop along the way to your final destination
or using traceroute, you're never going to understand where a perceived
problem lies. Again, networking books and google are your friends here.
HTH,
epi
> 2/ how do I kow the average ms is good or not?
>
> 3/ Which one (unix or window) is best for testing?
>
> Thank you very much for your advice
>
> Reply from 66.49.4.148: bytes=32 time=99ms TTL=57
> Reply from 66.49.4.148: bytes=32 time=109ms TTL=57
> Reply from 66.49.4.148: bytes=32 time=100ms TTL=57
> Reply from 66.49.4.148: bytes=32 time=95ms TTL=57
>
> Ping statistics for 66.49.4.148:
> Packets: Sent = 3534, Received = 3527, Lost = 7
> (0% loss),
^^^^^^^
> Approximate round trip times in milli-seconds:
> Minimum = 89ms, Maximum = 640ms, Average = 102ms
> Control-C
>
>
> -
>
>
>
> _______________________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com.hk address at http://mail.english.yahoo.com.hk
> _______________________________________________
> freebsd-questions@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to
> "freebsd-questions-unsubscribe@freebsd.org"
>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040621082617.4a0a5b48>