I try to duplicate packets and foward into two NIC using pfil, the source code as follow. But the pfil can't catch ethernet header. Is any one help me how can catch ethernet header using pfil.
See the support ticket for a response. On 14-02-16 10:38 PM, rich lee wrote: > I try to duplicate packets and foward into two NIC using pfil, the source code as follow. But the pfil can't catch ethernet header. Is any one help me how can catch ethernet header using pfil. > > > > _______________________________________________ > > General > http://community.qnx.com/sf/go/post108826 > To cancel your subscription to this discussion, please e-mail general-networking-unsubscribe@community.qnx.com
I am interesting in this topic, too The attached jpgs shows that the duplicated outgoing packet did not include the source Ethernet MAC address of the 2nd interface. It is very strange situation that the Ethernet driver did not prefix MAC and pass it out directly. Does the pfil of QNX is 100% equal to FreeBSD?
The issue was that in the sample provided there's an expectation that the full frame was being passed to the output hook in this particular case the IP packet was in the mbuf, need to set AF_INET and to set the destination IP address so the stack resolves it and prepends the ethernet header prior to sending the packet. See the attached sample.
The pointer *p address null, so the program crash. What should I write for this pointer? Take destination ip 192.168.1.1 for example, how to fill-in this p pointer? Or, do you mean take ip from output_hook mbuf?
My patch missed a line: Add p = mtod(m1, char*); after line 89 (memset()). I have updated the support ticket with this same response. See attached file which has the correct patch. Sorry about that. On 14-02-20 07:24 PM, rich lee wrote: > The pointer *p address null, so the program crash. What should I write for this pointer? Take destination ip 192.168.1 .1 for example, how to fill-in this p pointer? Or, do you mean take ip from output_hook mbuf? > > > > _______________________________________________ > > General > http://community.qnx.com/sf/go/post108966 > To cancel your subscription to this discussion, please e-mail general-networking-unsubscribe@community.qnx.com
Use new program to send two NIC is OK now. But when I break the original line, the mirror line also stop to work. I hope when i break the original line , the mirror line can still transmit. How can i do?
I am not sure I understand what you are asking, but I attached and updated and simpler version of the port mirroring module. Again it is provided as-is, but it works a lot better than my initial version. On 14-05-08 03:22 AM, rich lee wrote: > Use new program to send two NIC is OK now. But when I break the original line, the mirror line also stop to work. I hope when i break the original line , the mirror line can still transmit. How can i do? > > > > _______________________________________________ > > General > http://community.qnx.com/sf/go/post110211 > To cancel your subscription to this discussion, please e-mail general-networking-unsubscribe@community.qnx.com
