Usually if your looking at raw packets you want to use BPF.
-Kip
On Wed, 9 Jul 2003, Alin-Adrian Anton wrote:
> Hey folks,
>
> I wrote my piece of code to play with, and it uses raw sockets to send
> TCP packets. It sends packets okay, everything tested with a sniffer,
> everything is really really fine, but it seems I cannot recvfrom
> anything. I mean, it just keeps waiting and doesn't see the reply the
> server is actually sending (can be seen with a sniffer). I read that the
> freebsd kernel does not duplicate any incoming TCP/UDP packets to any of
> the opened raw sockets. Is that true? So the only solution is to use the
> interface in promiscuous mode and sniff like a sniffer for the expected
> packet? Is there any other way?
>
> PS: ICMP gets received well with recvfrom (tested).
>
> On Linux, it does work for tcp/udp too with recvfrom.
>
>
> I was also wondering if anyone could help me understand why this
> behaviour in freebsd? (or *BSD)
>
> Thanks!
>
> Best Regards,
> Alin.
>
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