Date: Thu, 10 Jul 2003 14:16:18 -0700 (PDT) From: Kip Macy <kmacy@netapp.com> To: Alin-Adrian Anton <aanton@reversedhell.net> Cc: freebsd-hackers@freebsd.org Subject: Re: tcp raw socket programming recvfrom() Message-ID: <Pine.GSO.4.10.10307101416000.12648-100000@cranford-fe.eng.netapp.com> In-Reply-To: <3F0BDDC9.9080102@reversedhell.net>
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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. > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >
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