netdev - Re: How To Temporarily Suspend Network Traffic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 01 Feb 2011 09:32:32 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Volkan YAZICI <volkan.yazici@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: How To Temporarily Suspend Network Traffic

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

> 
> Regards.
> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html