Other patterns of interest are 0x2020 (minimum ones density), and 0x5555
(alternating ones & zeroes; good for finding misoptioned telco equip. on
DS3's).
--phil
On Mon, 13 Nov 2000, Chuck Larrieu wrote:
Interesting.
It would appear that someone at Cisco had a better sense of humor than did
someone at WinToys :->
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Paul
Werner
Sent: Monday, November 13, 2000 6:46 PM
To: [EMAIL PROTECTED]
Subject: Re: Subject: Default Ping Payload
> 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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