From owner-freebsd-net@FreeBSD.ORG Sat Mar 17 16:22:30 2012 Return-Path: Delivered-To: net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 607BA1065670 for ; Sat, 17 Mar 2012 16:22:30 +0000 (UTC) (envelope-from oliver@FreeBSD.org) Received: from avocado.salatschuessel.net (avocado.salatschuessel.net [78.111.72.186]) by mx1.freebsd.org (Postfix) with SMTP id B42B18FC1B for ; Sat, 17 Mar 2012 16:22:29 +0000 (UTC) Received: (qmail 58909 invoked by uid 80); 17 Mar 2012 16:22:27 -0000 Received: from dsdf-4db5da51.pool.mediaWays.net (dsdf-4db5da51.pool.mediaWays.net [77.181.218.81]) by avocado.salatschuessel.net (Horde Framework) with HTTP; Sat, 17 Mar 2012 17:22:27 +0100 Date: Sat, 17 Mar 2012 17:22:27 +0100 Message-ID: <20120317172227.Horde.tDn5QKQd9PdPZLpDyq9bvcA@avocado.salatschuessel.net> From: Oliver Lehmann To: net@freebsd.org User-Agent: Internet Messaging Program (IMP) H4 (5.0.19) Content-Type: text/plain; charset=ISO-8859-1; format=flowed; DelSp=Yes MIME-Version: 1.0 Content-Disposition: inline Cc: Subject: invalid MAC addresses? X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 17 Mar 2012 16:22:30 -0000 Hi, when I update the BIOS of my new AM3+ Mainboard, The MAC address of my re0 card gets changed from c8:60:00:60:3b:c6 to ed:0b:00:00:e0:00 With this change, no communication with any other FreeBSD system is possible. When I try to ping another FreeBSD system, all I can see on the system I ping with tcpdump is: # tcpdump -i fxp0 -n -vv tcpdump: listening on fxp0, link-type EN10MB (Ethernet), capture size 65535 bytes 17:06:50.689424 IP (tos 0x0, ttl 120, id 3004, offset 0, flags [none], proto ICMP (1), length 84) 10.111.72.186 > 10.111.72.185: ICMP echo request, id 47626, seq 0, length 64 17:06:50.689488 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.111.72.186 tell 10.111.72.185, length 28 17:06:50.689758 ARP, Ethernet (len 6), IPv4 (len 4), Reply 10.111.72.186 is-at ed:0b:00:00:e0:00, length 46 But the MAC address gets not stored in the ARP cache of the pinged system and now answer is sent back to the pinging system: # arp -n 10.111.72.186 ? (10.111.72.186) at (incomplete) on fxp0 expired [ethernet] 10.111.72.186 is the system with the changed BIOS/MAC address from where I issued a ping to 10.111.72.185 Both systems are connected together with a crossover cable. When I attach the system with the changed MAC adress to a switch, and issue dhclient command, the system which does not answered my ping before, hands out an IP adress to this system (it is my DHCP server) Then again - ping does not work to any FreeBSD system attached to this switch. Pinging a Windows system works and I can even ping my network printer attached to this switch. So I wonder what is wrong with this MAC Address that FreeBSD does not like it? :( Greetings, Oliver