From owner-freebsd-net@FreeBSD.ORG Wed Dec 3 22:40:03 2008 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 63EA61065670 for ; Wed, 3 Dec 2008 22:40:03 +0000 (UTC) (envelope-from benjie@addgene.org) Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.240]) by mx1.freebsd.org (Postfix) with ESMTP id 1D2A28FC0A for ; Wed, 3 Dec 2008 22:40:03 +0000 (UTC) (envelope-from benjie@addgene.org) Received: by an-out-0708.google.com with SMTP id b6so1520448ana.13 for ; Wed, 03 Dec 2008 14:40:01 -0800 (PST) Received: by 10.142.238.4 with SMTP id l4mr5507278wfh.98.1228344001061; Wed, 03 Dec 2008 14:40:01 -0800 (PST) Received: by 10.142.179.19 with HTTP; Wed, 3 Dec 2008 14:40:01 -0800 (PST) Message-ID: Date: Wed, 3 Dec 2008 17:40:01 -0500 From: "Benjie Chen" To: "Peter Jeremy" In-Reply-To: <20081203193609.GB58682@server.vk2pj.dyndns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <20081203193609.GB58682@server.vk2pj.dyndns.org> Cc: freebsd-net@freebsd.org Subject: Re: Weird TCP connect issue in FreeBSD 6 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: Wed, 03 Dec 2008 22:40:03 -0000 Peter, Thanks for the response. When I had two IPs from two different subnets configured for the two NICs, I had the same error. So while I did have a configuration issue, the problem with replicated SYNs did occur even when the two NICs had IP addresses on different networks. Benjie On Wed, Dec 3, 2008 at 2:36 PM, Peter Jeremy wrote: > On 2008-Dec-02 15:10:11 -0500, Benjie Chen wrote: >>I have a weird issue to report, and I am not sure if it's a bug or >>some other configuration problem. > > I would suggest it is a configuration problem. > >>Server is a dual NICed FreeBSD 6.2 system. For example, one NIC is em0 >>= 192.168.0.1, and the other one is em1 = 192.168.0.2. > > This is not a supported configuration - you cannot have addresses within > the same subnet on more than one interface. > >>I just switched to using IP aliasing on the same NIC, and so far I >>have not been able to re-produce the same problem. > > This is the correct configuration. > > -- > Peter Jeremy > Please excuse any delays as the result of my ISP's inability to implement > an MTA that is either RFC2821-compliant or matches their claimed behaviour. >