> When conducting ping tests from one of our remote routers, I
get anywhere from 5-13% packet loss when using the default ping
payload, yet when I change the payload to anything else--such
as all ones, all zeroes, alternating ones and zeroes--I get no
packet loss whatsoever.
> This holds true regardless of packet size. However, when
using the default data pattern, larger packets get dropped more
often than smaller packets. We are seeing zero input or output
errors on this interface.
>
> This seems VERY strange to me, but I think I'll get closer to
an answer when I find out what the default pattern is.
>
> Do any of you know what that is?
If you were going from a Cisco router to a Cisco router, it
would look like this(watch wrap on all links):
http://www.west-
point.org/users/usma1983/40768/Chesinc/docs/CiscotoCisco.txt
If you were pinging from a Winthing to a Cisco device, it might
look like this:
http://www.west-
point.org/users/usma1983/40768/Chesinc/docs/WinthingtoCisco.txt
You will note that the results vary based upon the operating
system involved. For a Cisco device, the repeating pattern is
the following in binary:
1010101111001101
Which in hex is ABCD. You can vary the pattern to any four
value hex character combination that you choose. Obvious
choices would be 0x0000 or 0xFFFF or maybe 0xAAAA (equal mix of
ones and zeros in the payload). Of course, you will need to be
in priviledge mode to do an extended ping and ensure you
choose "extended commands".
HTH,
Paul Werner
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