From owner-freebsd-net@FreeBSD.ORG Fri May 2 21:06:39 2003 Return-Path: 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 D9E1437B401 for ; Fri, 2 May 2003 21:06:39 -0700 (PDT) Received: from chikage.wsyntax.com (66-214-183-33.la-cbi.charterpipeline.net [66.214.183.33]) by mx1.FreeBSD.org (Postfix) with SMTP id 2770C43FA3 for ; Fri, 2 May 2003 21:06:39 -0700 (PDT) (envelope-from raymond@chikage.wsyntax.com) Received: (qmail 39143 invoked by uid 83); 3 May 2003 04:06:38 -0000 Received: from mahoro.wsyntax.com (HELO chikage.wsyntax.com) (raymond@192.168.1.100) by chikage.wsyntax.com with SMTP; 3 May 2003 04:06:38 -0000 Message-ID: <3EB3404E.5030103@chikage.wsyntax.com> Date: Fri, 02 May 2003 21:06:38 -0700 From: Raymond Jimenez User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.1) Gecko/20021225 X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd-net@freebsd.org Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: IPv6 Neighbor Discovery Problem with dc(4) X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.1 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, 03 May 2003 04:06:40 -0000 On my network, several machines are having trouble recognizing an icmp6 neighbor solicitation. This only happens to me when I use the dc driver, in combination with the ADMTek AN985 10/100BaseTX chipset. The machines are running a combination of 4.7 and -CURRENT. The network topology consists of 3 switches, 2 of Linksys make, and 1 of Gigafast make. The computers will not recognize each other even when on the same switch. Tcpdump on the sender of the packet shows that the other interface (should be) reciving the packets, but is sending out no reply. When two computers are using any other driver than dc(4), they can ping each other. However, when tcpdump is done on the system with dc, the other can ping it and send data packets back and forth. It continues working after tcpdump is stopped. I've searched, and found nothing. Is there something I should check? Thanks in advance. -- Below is the output of tcpdump -nlvvve ip6 (on the system that is ping6'ing the one with the dc(4) driver) [raymond@shirayuki raymond]$ sudo tcpdump -nlevvv ip6 | tee Password: tcpdump: listening on ep0 20:57:37.306117 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:38.306194 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:39.306283 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:41.306427 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:42.306501 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:43.306572 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:45.306743 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) 20:57:46.306801 0:60:97:93:af:d0 33:33:ff:1a:49:c8 86dd 86: 2001:470:1f00:256:260:97ff:fe93:afd0 > ff02::1:ff1a:49c8: icmp6: neighbor sol: who has 2001:470:1f00:256:203:6dff:fe1a:49c8(src lladdr: 00:60:97:93:af:d0) (len 32, hlim 255) ^C 47 packets received by filter 0 packets dropped by kernel [raymond@shirayuki raymond]$ ping6 sakura.wsyntax.com PING6(56=40+8+8 bytes) 2001:470:1f00:256:260:97ff:fe93:afd0 --> 2001:470:1f00:256:203:6dff:fe1a:49c8 ^C --- sakura.wsyntax.com ping6 statistics --- 56 packets transmitted, 0 packets received, 100% packet loss -- Raymond Jimenez http://chikage.wsyntax.com <> cyanoacry@rakka.irc.wsyntax.com