From owner-freebsd-current@FreeBSD.ORG Mon Nov 8 19:17:46 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 766CA16A4CE; Mon, 8 Nov 2004 19:17:46 +0000 (GMT) Received: from avscan2.sentex.ca (avscan2.sentex.ca [199.212.134.19]) by mx1.FreeBSD.org (Postfix) with ESMTP id D35B943D2F; Mon, 8 Nov 2004 19:17:45 +0000 (GMT) (envelope-from mike@sentex.net) Received: from localhost (localhost.sentex.ca [127.0.0.1]) by avscan2.sentex.ca (8.12.11/8.12.11) with ESMTP id iA8JHjac071902; Mon, 8 Nov 2004 14:17:45 -0500 (EST) (envelope-from mike@sentex.net) Received: from avscan2.sentex.ca ([127.0.0.1]) by localhost (avscan2.sentex.ca [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 70897-10; Mon, 8 Nov 2004 14:17:45 -0500 (EST) Received: from lava.sentex.ca (pyroxene.sentex.ca [199.212.134.18]) by avscan2.sentex.ca (8.12.11/8.12.11) with ESMTP id iA8JHjk0071851; Mon, 8 Nov 2004 14:17:45 -0500 (EST) (envelope-from mike@sentex.net) Received: from simian.sentex.net (simeon.sentex.ca [192.168.43.27]) by lava.sentex.ca (8.12.11/8.12.11) with ESMTP id iA8JHbcj026455; Mon, 8 Nov 2004 14:17:38 -0500 (EST) (envelope-from mike@sentex.net) Message-Id: <6.1.2.0.0.20041108141521.07c8bbf8@64.7.153.2> X-Sender: mdtpop@64.7.153.2 (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.1.2.0 Date: Mon, 08 Nov 2004 14:24:41 -0500 To: Robert Watson , astesin@ukrtelecom.net From: Mike Tancsa In-Reply-To: References: <1152675CA9EDD71187130002B3CE5ADA10660EB1@hoexc010.ukrtelecom.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed X-Virus-Scanned: by amavisd-new X-Virus-Scanned: by amavisd-new at avscan2b cc: freebsd-current@freebsd.org Subject: Re: em0, VLAN and bpf(?) trouble w/RELENG_5 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 08 Nov 2004 19:17:46 -0000 At 11:16 AM 08/11/2004, Robert Watson wrote: >(1) If you run tcpdump on the em0 interface itself, does the same thing > happen? I can easily reproduce this. The first tcpdump works fine. But when you stop dumping, no packets come through. Start the tcpdump on em0 and then stop it works. Then start it again on em0, the flow stops, even though tcpdump says the NIC is forwarding. Stop the dump and packets flow normal. 5.3-STABLE FreeBSD 5.3-STABLE #0: Fri Nov 5 Using tcpdump # tcpdump -i vlan0 -n tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on vlan0, link-type EN10MB (Ethernet), capture size 96 bytes 14:09:44.895401 IP 10.2.2.1 > 10.2.2.2: icmp 64: echo request seq 13312 14:09:44.895418 IP 10.2.2.2 > 10.2.2.1: icmp 64: echo reply seq 13312 14:09:45.596227 00:0b:be:69:14:9a > 01:00:0c:cc:cc:cd sap aa ui/C len=39 14:09:45.905417 IP 10.2.2.1 > 10.2.2.2: icmp 64: echo request seq 13568 14:09:45.905427 IP 10.2.2.2 > 10.2.2.1: icmp 64: echo reply seq 13568 14:09:46.915437 IP 10.2.2.1 > 10.2.2.2: icmp 64: echo request seq 13824 14:09:46.915447 IP 10.2.2.2 > 10.2.2.1: icmp 64: echo reply seq 13824 14:09:47.595903 00:0b:be:69:14:9a > 01:00:0c:cc:cc:cd sap aa ui/C len=39 14:09:47.925455 IP 10.2.2.1 > 10.2.2.2: icmp 64: echo request seq 14080 14:09:47.925465 IP 10.2.2.2 > 10.2.2.1: icmp 64: echo reply seq 14080 14:09:48.935475 IP 10.2.2.1 > 10.2.2.2: icmp 64: echo request seq 14336 14:09:48.935485 IP 10.2.2.2 > 10.2.2.1: icmp 64: echo reply seq 14336 14:09:49.595828 00:0b:be:69:14:9a > 01:00:0c:cc:cc:cd sap aa ui/C len=39 14:09:49.945493 IP 10.2.2.1 > 10.2.2.2: icmp 64: echo request seq 14592 14:09:49.945503 IP 10.2.2.2 > 10.2.2.1: icmp 64: echo reply seq 14592 ^C 15 packets captured 15 packets received by filter 0 packets dropped by kernel It seems to be sending it back, but its not. Soon as I end the tcpdump, it starts sending again. This is a test setup, so I can crash / test whatever you like. ---Mike