From owner-freebsd-questions@FreeBSD.ORG Thu Feb 22 18:51:35 2007 Return-Path: X-Original-To: questions@freebsd.org Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 0B47A16A402 for ; Thu, 22 Feb 2007 18:51:35 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from mail-out3.apple.com (mail-out3.apple.com [17.254.13.22]) by mx1.freebsd.org (Postfix) with ESMTP id ADC4513C441 for ; Thu, 22 Feb 2007 18:51:34 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from relay5.apple.com (a17-128-113-35.apple.com [17.128.113.35]) by mail-out3.apple.com (8.13.8/8.13.8) with ESMTP id l1MIpXgn011775; Thu, 22 Feb 2007 10:51:33 -0800 (PST) Received: from relay5.apple.com (unknown [127.0.0.1]) by relay5.apple.com (Symantec Mail Security) with ESMTP id EA0C529C003; Thu, 22 Feb 2007 10:51:32 -0800 (PST) X-AuditID: 11807123-a13bbbb000000a1d-ef-45dde634762d Received: from [17.214.13.96] (cswiger1.apple.com [17.214.13.96]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by relay5.apple.com (Apple SCV relay) with ESMTP id D262030400D; Thu, 22 Feb 2007 10:51:32 -0800 (PST) In-Reply-To: <45DD84C1.70308@esiee.fr> References: <45DD84C1.70308@esiee.fr> Mime-Version: 1.0 (Apple Message framework v752.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: Chuck Swiger Date: Thu, 22 Feb 2007 10:51:31 -0800 To: Frank Bonnet X-Mailer: Apple Mail (2.752.2) X-Brightmail-Tracker: AAAAAA== Cc: FreeBSD Questions Subject: Re: Transparent redirect to another interface ? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Feb 2007 18:51:35 -0000 On Feb 22, 2007, at 3:55 AM, Frank Bonnet wrote: > I have a new mailhub with two ethernet gigabit interfaces, and I > would like to > transparently redirect IMAP or POP3 requests to the second > interface which > have a different IP address, to let the first interface drive the > SMTP traffic only. > > Is it possible? This will avoid thousands of email clients re- > configuration to > let users grab their incomming emails. Configuring the two interfaces with two different IP addresses is no problem at all, presuming that these IP addresses reside in different subnets. If both IPs reside in the same subnet, you are better off configuring the second IP as an alias on the first interface, and using the second NIC for some other purpose. You can do other things, such as using ng_fec to perform "port trunking", or using IPFW or some other thing to manually force traffic out of the other interface, but it's unlikely to result in much benefit. -- -Chuck