On Tue, Feb 01, 2011 at 03:56:05PM +0200, Volkan YAZICI wrote: > 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, > connection isn't get recovered; for wired, 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? Or > can you point me to some other resource/mailing-list that I can consult?
It depends on exactly what behavior you're aiming for. If you just want all packets going in or out on that interface to be dropped, you can do it pretty effectively with iptables. The following will drop all packets coming in through the wlan0 interface: iptables -A PREROUTING -i wlan0 -j DROP This will drop all packets destined to be sent out the wlan0 interface: iptables -A POSTROUTING -o wlan0 -j DROP You can remove each rule by changing the -A to a -D. Now, those are the actual commands to run from the shell. You aren't going to get microsecond granularity that way. You can, however, dig into the iptables source and see what system calls it's making as a result of those options and use it in your own code. I don't know if that will get you to microsecond granularity, but you'll have to do your own profiling to check. > Regards. --Greg -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110201141616.gf11...@anthropohedron.net
