From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Furniss Date: Thu, 05 Jul 2007 11:21:41 +0000 Subject: Re: [LARTC] Weird rate in HTB Message-Id: <468CD445.30207@andyfurniss.entadsl.com> List-Id: References: <200707032249.09935.daniel@mks.padinet.com> In-Reply-To: <200707032249.09935.daniel@mks.padinet.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lartc@vger.kernel.org Daniel Harold L. wrote: > Dear all, > > First, sorry for my bad English .. > > To night one of my client is the victim of UDP attack from internet. It's tons > of UDP packets from internet with destination to port 80. But when I look at > class of that victim client, the actual class rate is over than configured > rate class. > > Below is my screen capture. You can see at class 1:913 which have actual rate > 105136bit while configured with ceil at 96000bit. Also it's parent class > (1:91) which have actual rate 107680bit while configured with ceil at > 96000bit. > > Is this normal? Or I have miss something in my script. Sometimes ago I found > this situation but I forgot to capture the screen and the traffic is UDP too > (maybe from torrent-like client) Yes it is normal! The rate tables that tc use normally have an 8 byte steps, so it is possible for up to a 56bit/s error per packet and you have 300 pps. There was a small patch submitted for tc to make the error fall on the underrate rather than overrate side, but I think it got lost in the middle of the long ATM overhead patch thread on netdev. Andy. _______________________________________________ LARTC mailing list LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc