On Tue, Nov 27, 2012 at 09:28:32AM +0100, J. Hannken-Illjes wrote: > > When I start "tcpdump -i vr0" on NET5501 / NetBSD 6.0, all incoming traffic > > stops for 30 seconds and when I kill tcpdump it happens again. Other > > interfaces work normally during this time. I got this in kernel log: > > Most likely switching promiscuous mode on and off. Some controllers > have to re-negotiate the link. Giving the `-p' flag to tcpdump disables > promiscuous mode. Indeed, this helps. Thanks! Jukka