From owner-freebsd-bugs  Thu Apr 23 18:10:03 1998
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id SAA28607
          for freebsd-bugs-outgoing; Thu, 23 Apr 1998 18:10:03 -0700 (PDT)
          (envelope-from owner-freebsd-bugs@FreeBSD.ORG)
Received: (from gnats@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id SAA28588;
          Thu, 23 Apr 1998 18:10:01 -0700 (PDT)
          (envelope-from gnats)
Received: from whistle.com (s205m131.whistle.com [207.76.205.131])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id SAA28341
          for <FreeBSD-gnats-submit@freebsd.org>; Thu, 23 Apr 1998 18:08:07 -0700 (PDT)
          (envelope-from archie@whistle.com)
Received: (from smap@localhost) by whistle.com (8.7.5/8.6.12) id SAA01677 for <FreeBSD-gnats-submit@freebsd.org>; Thu, 23 Apr 1998 18:07:33 -0700 (PDT)
Received: from bubba.whistle.com(207.76.205.7) by whistle.com via smap (V1.3)
	id sma001675; Thu Apr 23 18:07:24 1998
Received: (from archie@localhost) by bubba.whistle.com (8.8.7/8.6.12) id SAA28219; Thu, 23 Apr 1998 18:07:24 -0700 (PDT)
Message-Id: <199804240107.SAA28219@bubba.whistle.com>
Date: Thu, 23 Apr 1998 18:07:24 -0700 (PDT)
From: Archie Cobbs <archie@whistle.com>
Reply-To: archie@whistle.com
To: FreeBSD-gnats-submit@FreeBSD.ORG
X-Send-Pr-Version: 3.2
Subject: kern/6402: another machine can change my own permanent arp table entry
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


>Number:         6402
>Category:       kern
>Synopsis:       another machine can change my own permanent arp table entry
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 23 18:10:00 PDT 1998
>Last-Modified:
>Originator:     Archie Cobbs
>Organization:
Whistle Communications, Inc.
>Release:        FreeBSD 2.2.6-RELEASE i386
>Environment:

	FreeBSD 2.2.6

>Description:

	If an ARP packet is received on interface #1 that advertises an
	IP address that I have assigned for interface #2, then the
	received entry will override my own permanent ARP entry.

>How-To-Repeat:

	1. ifconfig ed0  1.2.3.4
	2. ifconfig ed2  4.5.6.7
	3. Attach ed2 to a network with another machine having
	   address 1.2.3.4
	4. Make other machine broadcast its own ARP packet having
	   its address 1.2.3.4 and its ethernet address. I think
	   you can do this by ifconfig'ing the interface on the
	   other machine
	5. Notice kernel log: arp: 1.2.3.4 moved from XXX to YYY
	   where XXX is my ethernet address and YYY is other machine's

>Fix:
	
	netinet/if_ether.c ?

>Audit-Trail:
>Unformatted:

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message