From owner-freebsd-net@FreeBSD.ORG Tue Apr 1 12:48:22 2014 Return-Path: Delivered-To: net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 8AD73501 for ; Tue, 1 Apr 2014 12:48:22 +0000 (UTC) Received: from mail-ie0-x236.google.com (mail-ie0-x236.google.com [IPv6:2607:f8b0:4001:c03::236]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 59100D96 for ; Tue, 1 Apr 2014 12:48:22 +0000 (UTC) Received: by mail-ie0-f182.google.com with SMTP id y20so9154968ier.27 for ; Tue, 01 Apr 2014 05:48:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=M4NR0s98PeKjoiuB33u8mxd617o2rDlVdbBJ81Te8Og=; b=Sf3bDo+y4cj2OBCO17bBY6VligR8NI26A61cH7mtRyUCyDXPMCb6UKhT6XOglHHSPa h1e8D5uVZzlC0EpowaegObrZi8h6/dDfF9V4SGA6gzliagLv2VQrRq6TGPrp5DXDtoGh YSmzVjsiB/Jg7600ZQIXu+dF16eCuvDen5qT4Bbdzn1bPehGYoAMiGIJC/CSmkZc0+Ih s2K1DEnepIMEeOtrfTNUull/EgX6Ig27At0IJMu710Jp4b4WG7Jsfqu+IxSx/Gmw7mYO VGXuoh2IPCDEpA2Q68WYx2L9ZYMkEiYl+8+Zo9tfHhnmfjN6ioJoUCDhNx8LI50wUZdf GpLg== MIME-Version: 1.0 X-Received: by 10.50.111.135 with SMTP id ii7mr1708696igb.35.1396356501760; Tue, 01 Apr 2014 05:48:21 -0700 (PDT) Sender: vrwmiller@gmail.com Received: by 10.64.235.212 with HTTP; Tue, 1 Apr 2014 05:48:21 -0700 (PDT) In-Reply-To: <5339D0A0.1030903@rcn.com> References: <5339D0A0.1030903@rcn.com> Date: Tue, 1 Apr 2014 08:48:21 -0400 X-Google-Sender-Auth: pbuC-SXa2wRJI35Q2zFiihasOEw Message-ID: Subject: Re: questions about (system) dhclient From: Rick Miller To: Robert Huff Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.17 Cc: net@freebsd.org X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 01 Apr 2014 12:48:22 -0000 On Mon, Mar 31, 2014 at 4:31 PM, Robert Huff wrote: > [Please keep me CC'd as I am not subscribed. Thanks.] > > I have a system, running r263263, where dhclient is misbehaving. > (Yes - this is CURRENT, but I have no reason to believe this inherently a > version-specific issue. I am also on current@, and nothing like this has > been reported.) > The system has an Intel Pro/1000 ethernet card, "em0", connected > to a Arris CM820 cable modem. > This is the relevant portion of dhclient.conf: > > http://users.rcn.com/dhclient.conf > > Upon execution, I get this: > > http://users.rcn.com/roberthuff/dhcp_offer The conversation between a DHCP server and client consists of the initial DHCP DISCOVER request from the client broadcasted to the network to which a DHCP ACK is expected in reply from an available DHCP server. Upon receipt of DHCP ACK, the client sends another DHCP DISCOVER to the server asking for configuration information necessary to initialize networking. The server's response is a DHCP OFFER containing all the information requested by the client. I illustrate this in a sequence diagram describing a PXE workflow for FreeBSD installation at http://hostileadmin.com/images/FreeBSD_PXE_Install_Workflow.gif. The first four steps in the sequence is the workflow's first DHCP conversation. This output suggests only half of the conversation was completed. The client doesn't appear to have sent the second DHCP DISCOVER and thusly did not receive configuration information from the server. Have you ran packet captures to determine whether or not the whole conversation is occurring? -- Take care Rick Miller