Re: libpcap linux direction

[Aaron Turner <synfinatic () gmail com>]

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.

-- 
Aaron Turner
http://synfin.net/
http://tcpreplay.synfin.net/ - Pcap editing and replay tools for Unix & Windows
Those who would give up essential Liberty, to purchase a little
temporary Safety,
deserve neither Liberty nor Safety.
    -- Benjamin Franklin
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