Re: Ping TOS to test QOS...

Along with good pointers others are giving remember, that ICMP ECHO REPLY
will be marked with the same DSCP ( and IPP and TOS*). So if you ping with
DSCP EF (TOS 184), expect the reply to be also marked with EF/184

*almost always, except for ECN marked traffic. If the incoming DS Field
would have EC Capable and EC Congestion Experienced bits set, only one or
none of the bits would be marked in backwards direction, based on device
capability.

On Wed, Apr 22, 2009 at 11:07 PM, Modular <modulartx_at_gmail.com> wrote:

> I had a thought, (don't laugh, it happens), is it possible to use the TOS
> setting
> in extended Ping to test QOS classification? I did a little research on
> conversion
> of TOS byte setting to IPP or DSCP and the best I could come up with is
> that
> a TOS of 1 or 8 would convert to IPP 1 or DSCP 8? I played around with it
> for awhile, setting up a policy-map to match DSCP 1, DSCP 8 and IPP 1
> and then set to TOS in the extended ping on a different router to 1 and
> none of the class maps in the policy map had packet counts greater than 0.
>
> Either I'm converting TOS to IPP/DSCP wrong or I'm completely off base with
> this.?.?
>
>
> Bryan R.
>
>
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