Ricardo Branco wrote: > Using libpcap to put the interface in promiscuous mode, will cause that > ifconfig(8) doesn't show it! > > libpcap uses setsockopt(..., SOL_PACKET, PACKET_ADD_MEMBERSHIP, ...) with > PACKET_MR_PROMISC to set the interface in promiscuous mode. > > I notified this to the tcpdump-workers mailing list and the problem is > that the setsockopt() sets the promisc flag in a variable that is not the > same as the one that the SIOCGIFFLAGS ioctl() reads. I don't have the > kernel source right now to make this advisory more precise. This issue was discussed extensively on the linux-net list back in February, in the thread entitled "IFF_PROMISC bug?": http://marc.theaimsgroup.com/?t=101356558000002&r=1&w=2 -- Glynn Clements <glynn.clements@virgin.net>
