Is this a bug in IOS? Very strange POLICING issue ,any one

From: sirus MOGHADASIAN (cyrus.mgh@gmail.com)
Date: Sat May 19 2007 - 13:38:48 ART

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---------- Forwarded message ----------
From: sirus MOGHADASIAN <cyrus.mgh@gmail.com>
Date: May 18, 2007 3:05 AM
Subject: Very strange POLICING issue
To: Cisco certification <ccielab@groupstudy.com>

Hi group,

I have encounter strange behavior when I want to police traffic.

when I configure this : police 48000 conform-rate transmit exceed-action
drop
suddenly all my traffic lost and I cannot even surf web.

but when I change value from 48000 to 56000 my network begin working but at
rate of 29000!!
when I change it to 80000 it gets better ,my average come to 70000

Is that because of TCP slow start and windowing,?

if this behavior is by-product of TCP windowing system why 48000 cut off all
my traffic but with 56000 ,I have connectivity?

!
policy-map XXX
 class class-default
   police 48000 conform-action transmit exceed-action drop
!
!
interface FastEthernet0/0
 mac-address a456.aaaa.aaaa
 ip address dhcp
 ip nat outside
 service-policy input XXX
 duplex auto
 speed auto
!

Thanks

Sirus MGH

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