From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: How To Temporarily Suspend Network Traffic Date: Tue, 1 Feb 2011 09:49:23 -0800 Message-ID: <20110201094923.4fa6637f@nehalam> References: <87d3nbakwx.fsf@alamut.ozu.edu.tr> <4D4843B0.1090803@hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Volkan YAZICI , netdev@vger.kernel.org To: Rick Jones Return-path: Received: from mail.vyatta.com ([76.74.103.46]:36805 "EHLO mail.vyatta.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754085Ab1BARtc (ORCPT ); Tue, 1 Feb 2011 12:49:32 -0500 In-Reply-To: <4D4843B0.1090803@hp.com> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, 01 Feb 2011 09:32:32 -0800 Rick Jones wrote: > Volkan YAZICI wrote: > > Hi, > > > > I want to temporarily suspend the network traffic on a particular > > interface -- if possible, in microsecond granularity. For this purpose, > > ifup/ifdown ioctl() calls doesn't work. That is, for wireless > > interfaces, connection isn't get recovered; for wired interfaces, it > > takes at least 2 seconds to recover. I tried using tc, but it doesn't > > accept "rate 0" parameter. Neither "iwconfig wlan0 rate 0" has any > > effect. (Moreover, in iwconfig manual it is told that values below 1000 > > are card specific and are usually an index in the bit-rate list.) Do you > > have any suggestions? Can you recommend me to check any code piece in > > the kernel or some other tool? > > Out of not quite idle curiousity, what are you trying to accomplish? > > Instead of using tc to set a zero rate, you could perhaps try using tc to set a > delay? If it doesn't offer microseconds of delay, pehaps setting a delay and > then eliminating it after your own pause will do what you want - depends of > course on what it is you really want. Your saying you wanted microsecond > granularity suggests you don't want to suspend traffic for very long? > > rick jones What about using tc mired to redirect to dummy device? or use netem drop