From owner-freebsd-net@FreeBSD.ORG Thu Feb 16 14:39:53 2012 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 75B28106566C for ; Thu, 16 Feb 2012 14:39:53 +0000 (UTC) (envelope-from aboyer@averesystems.com) Received: from zimbra.averesystems.com (75-149-8-245-Pennsylvania.hfc.comcastbusiness.net [75.149.8.245]) by mx1.freebsd.org (Postfix) with ESMTP id 40DF28FC12 for ; Thu, 16 Feb 2012 14:39:52 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by zimbra.averesystems.com (Postfix) with ESMTP id B9E9C446005; Thu, 16 Feb 2012 09:42:17 -0500 (EST) X-Virus-Scanned: amavisd-new at averesystems.com Received: from zimbra.averesystems.com ([127.0.0.1]) by localhost (zimbra.averesystems.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id SWvlh1LV8Wg2; Thu, 16 Feb 2012 09:42:10 -0500 (EST) Received: from riven.arriad.com (fw.arriad.com [10.0.0.16]) by zimbra.averesystems.com (Postfix) with ESMTPSA id 4BA8E446002; Thu, 16 Feb 2012 09:42:10 -0500 (EST) Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=us-ascii From: Andrew Boyer In-Reply-To: <4F3D0197.60100@my.gd> Date: Thu, 16 Feb 2012 09:39:46 -0500 Content-Transfer-Encoding: quoted-printable Message-Id: <37B92AD6-F745-4D26-A924-271476558D93@averesystems.com> References: <1329376106.7683.YahooMailNeo@web162203.mail.bf1.yahoo.com> <4F3D0197.60100@my.gd> To: "M. V." X-Mailer: Apple Mail (2.1084) Cc: freebsd-net@freebsd.org, Damien Fleuriot Subject: Re: Assigning multiple IPs in the same network to an interface 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: Thu, 16 Feb 2012 14:39:53 -0000 On Feb 16, 2012, at 8:16 AM, Damien Fleuriot wrote: > On 2/16/12 8:08 AM, M. V. wrote: >> hi everybody, >>=20 >> i have a problem with setting multiple IPs in the same network in = FreeBSD: >>=20 >> - suppose I assign two new IP addresses in the same network to eth0 = with ifconfig: >> #ifconfig eth0 add 192.168.10.1/24 >> #ifconfig eth0 add 192.168.10.2/24 >>=20 >> - everything works fine and the output of "netstat -r" is like what = it should be: >> #netstat -r >> .... >> 192.168.10.0 eth0 >> 192.168.10.1 lo0 >> 192.168.10.2 lo0 >> ... >>=20 >> - but now if I delete first IP address, connection to 192.168.10.0 = network will be gone. and in output of "netstat -r" the route to = 192.168.10.0 (via eth0) is gone: >> #ifconfig eth0 delete 192.168.10.1 >>=20 >> #netstat -r >> .... >>=20 >> 192.168.10.2 lo0 >> ..... >>=20 >> - am i missing something here? shouldn't the route to the network = remain in routing table (because we still have 192.168.10.2 assigned to = interface)? >>=20 >> Thanks. >>=20 >=20 > You shouldn't assign your secondary IP with a /24 mask, use /32. >=20 > You'll run into problems otherwise. >=20 > As a rule of thumb, your aliases =3D /32 >=20 M.V. - What you are doing should work fine. There were a handful of routing = table bugs fixed in the last few months that corrected this behavior. = The last two were just merged to stable/8 yesterday. What release are = you running? =20 -Andrew -------------------------------------------------- Andrew Boyer aboyer@averesystems.com