netdev - Re: How To Temporarily Suspend Network Traffic

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Message-ID: <20110201094923.4fa6637f@nehalam>
Date:	Tue, 1 Feb 2011 09:49:23 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Volkan YAZICI <volkan.yazici@...il.com>, netdev@...r.kernel.org
Subject: Re: How To Temporarily Suspend Network Traffic

On Tue, 01 Feb 2011 09:32:32 -0800
Rick Jones <rick.jones2@...com> 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

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