Re: libpcap linux direction

["David H. Lynch Jr." <dhlii () dlasys net>]

Thanks;
    How does one use pcap to transmit to both the net and the local host ?
    This seems to work with winpcap in colinux.
   


Aaron Turner wrote:
> On Thu, Mar 26, 2009 at 7:35 AM, David H. Lynch Jr. <dhlii () dlasys net> wrote:
>   
> >    I am using libpcap under linux as a pseudo NIC for an embeded system
> > emulator.
> >    I have no difficulty trapping a linux interface and sending and
> > receiving packets to the outside net.
> >    However, I am unable to send/receive packets to the IP of the
> > interface I  am trapping.
> >    I have tried adding a  pcap_setdirection(pd, PCAP_D_INOUT) which
> > succeeds but changes nothing.
> >     
>
> Correct.  You can't send traffic out an interface and expect it to be
> delivered to the same host.   It doesn't work that way.
> pcap_setdirection() is for limiting what packets are *read* by libpcap
> and has nothing with packet injection.
>
>   


-- 
Dave Lynch                                                  DLA Systems
Software Development:                                    Embedded Linux
717.627.3770           dhlii () dlasys net        http://www.dlasys.net
fax: 1.253.369.9244                                Cell: 1.717.587.7774
Over 25 years' experience in platforms, languages, and technologies too numerous to list.

"Any intelligent fool can make things bigger and more complex... It takes a touch of genius - and a lot of courage to 
move in the opposite direction."
Albert Einstein

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