From owner-freebsd-net@FreeBSD.ORG  Tue Apr 20 23:26:06 2004
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: freebsd-net@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 2958E16A4CE; Tue, 20 Apr 2004 23:26:06 -0700 (PDT)
Received: from rms04.rommon.net (rms04.rommon.net [212.54.2.140])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 0059943D31; Tue, 20 Apr 2004 23:26:04 -0700 (PDT)
	(envelope-from pete@he.iki.fi)
Received: from he.iki.fi (h91.vuokselantie10.fi [193.64.42.145])
	by rms04.rommon.net (8.12.10/8.12.9) with ESMTP id i3L6Q4mo073138;
	Wed, 21 Apr 2004 09:26:05 +0300 (EEST)
	(envelope-from pete@he.iki.fi)
Message-ID: <408613F7.1090806@he.iki.fi>
Date: Wed, 21 Apr 2004 09:25:59 +0300
From: Petri Helenius <pete@he.iki.fi>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
	rv:1.6) Gecko/20040113
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Luigi Rizzo <rizzo@icir.org>
References: <20040419110912.A71274@xorpc.icir.org>
In-Reply-To: <20040419110912.A71274@xorpc.icir.org>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
cc: net@freebsd.org
Subject: Re: what is the story on if_index allocation ?
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Apr 2004 06:26:06 -0000

Luigi Rizzo wrote:

>Can someone explain what is the goal ? Reuse a number if an
>interface has the same name of a previously existing one and
>the index is free ? And does it make sense, anyways, or
>we could just simplify that code and just reuse the first
>available entry in ifindex_table[] ?
>  
>
The optimal course of action (from management software point of view) is 
to retain as static ifName to ifIndex mapping. If the index changes for 
the same interface, you're supposed to have lower sysUpTime than on 
previous query.

Pete