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RE: Promiscuous Ethernet problem
I found that there has been a correction in the ethernet driver
regarding multicasts and promiscuous mode after the latest
developer board release.
> * Revision 1.21 2001/11/23 11:54:49 starvik
> * Added IFF_PROMISC and IFF_ALLMULTI handling in set_multicast_list
> * Removed compiler warnings
I will send you the updated files I have announced on this list
the last days. Unfortunately I can't send them to you all because
the mail list doesn't allow attachments > 30 KByte.
The updated files will probably not work if you are not using
the latest developer board release.
PS. I couldn't get your code to work properly
(I get setsockopt: Invalid argument) but I'm pretty sure that
the change above will solve your problem. DS.
Behalf Of email@example.com
Sent: Monday, July 01, 2002 4:40 PM
Subject: Promiscuous Ethernet problem
I'm working on an application for the ETRAX 100 LX, which is
supposed to read all packets from the Ethernet port.
The ETRAX is out-of-the-box, except two things:
I have set an IP address in /etc/network/network.cnf.
My application resides on /mnt/flash.
I open a raw socket, and set the interface to promiscuous mode
When I start the program, I get a message on the serial debug port
telling me that "device eth0 entered promiscuous mode".
When I terminate the program, I get the message
"device eth0 left promiscuous mode".
However, the only packets received by my application are those
addressed to the ETRAX's own MAC address or the broadcast
What am I doing wrong?
Here's how I set up the interface:
struct packet_mreq pr;
struct ifreq ir;
s = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
ioctl(s, SIOCGIFINDEX, &ir);
pr.mr_ifindex = ir.ifr_ifindex;
pr.mr_type = PACKET_MR_PROMISC;
setsockopt(s, SOL_PACKET, PACKET_ADD_MEMBERSHIP,
&pm, sizeof(struct packet_mreq));
None of the system calls fail, and as I said above, the OS reports
that the interface has gone promiscuous.
Any help is appreciated.