From owner-freebsd-questions Thu Jul 4 15:40:42 2002 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 21BF737B406 for ; Thu, 4 Jul 2002 15:40:39 -0700 (PDT) Received: from fepC.post.tele.dk (fepC.post.tele.dk [195.41.46.147]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2B93643E31 for ; Thu, 4 Jul 2002 15:40:38 -0700 (PDT) (envelope-from db@traceroute.dk) Received: from rafter ([80.197.219.206]) by fepC.post.tele.dk (InterMail vM.4.01.03.23 201-229-121-123-20010418) with SMTP id <20020704224036.FTGA9333.fepC.post.tele.dk@rafter> for ; Fri, 5 Jul 2002 00:40:36 +0200 Message-ID: <00b201c223ab$d120e950$8400a8c0@rafter> From: "Daniel Blankensteiner" To: References: <02070500425202.00991@FreeBSD.Danovitsch.LAN> Subject: Re: ICMP Date: Fri, 5 Jul 2002 00:40:37 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG ----- Original Message ----- From: "Daan Vreeken [PA4DAN]" > > I have been playing with socket programming for some time now and have > > moved on to raw sockets. (I don't use libnet or libpcap, because I first > > want to learn it from the bottom). > > I know how to send ICMP packets, but how do I receive? I can "take over" > > the hole networkcard and read all packets, but I just want the ones for > > my connection. If I set up a raw socket and send an ICMP I can get the > > response (because the ICMP have an ID-feild?), but that if I have setup > > a SOCK_STREAM or SOCK_DGRAM? How can I then detect ICMP? > Have you looked at how they do it in the "ping" program? > > ( see /usr/src/sbin/ping/ping.c ) Yes, but ping uses ICMP to ICMP, meaning that one ICMP ticker another and then it can be identified by the id-field, but I am talking about receiving an ICMP on fx a TCP connection. br db To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message