From owner-freebsd-net@FreeBSD.ORG Thu Mar 24 03:37:34 2005 Return-Path: <owner-freebsd-net@FreeBSD.ORG> Delivered-To: freebsd-net@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2A31F16A4CE for <freebsd-net@freebsd.org>; Thu, 24 Mar 2005 03:37:34 +0000 (GMT) Received: from mail.cs.ait.ac.th (mail.cs.ait.ac.th [192.41.170.16]) by mx1.FreeBSD.org (Postfix) with ESMTP id 69B5743D5D for <freebsd-net@freebsd.org>; Thu, 24 Mar 2005 03:37:32 +0000 (GMT) (envelope-from on@cs.ait.ac.th) Received: from banyan.cs.ait.ac.th (banyan.cs.ait.ac.th [192.41.170.5]) by mail.cs.ait.ac.th (8.12.11/8.12.11) with ESMTP id j2O3aX5d021123 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for <freebsd-net@freebsd.org>; Thu, 24 Mar 2005 10:36:33 +0700 (ICT) Received: (from on@localhost) by banyan.cs.ait.ac.th (8.13.1/8.12.11) id j2O3dpoN099306; Thu, 24 Mar 2005 10:39:51 +0700 (ICT) Date: Thu, 24 Mar 2005 10:39:51 +0700 (ICT) Message-Id: <200503240339.j2O3dpoN099306@banyan.cs.ait.ac.th> From: Olivier Nicole <on@cs.ait.ac.th> To: freebsd-net@freebsd.org X-Virus-Scanned: on CSIM by amavisd-milter (http://www.amavis.org/) Subject: Resolving MAC address X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>, <mailto:freebsd-net-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net> List-Post: <mailto:freebsd-net@freebsd.org> List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>, <mailto:freebsd-net-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 24 Mar 2005 03:37:34 -0000 Hi, Is there a command, or a short C code that I could use to resolve the MAC address for a given IP address? # ping -c 1 10.0.0.1 PING 10.0.0.1 (10.0.0.1): 56 data bytes 64 bytes from 10.0.0.1: icmp_seq=0 ttl=64 time=0.974 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 packets received, 0% packet loss round-trip min/avg/max/stddev = 0.974/0.974/0.974/0.000 ms # arp 10.0.0.1 ? (10.0.0.1) at 00:e0:29:ad:5a:aa on em0 [ethernet] will do the trick, but it is a bit too heavy for the purpose, I'd prefer a solution that only send an ARP request. Best regards, olivier