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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
Subject: another machine can change my own permanent arp table entry
X-Send-Pr-Version: 3.2

>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:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Apr 23 18:10:00 PDT 1998
>Closed-Date:    Wed Sep 16 17:08:47 PDT 1998
>Last-Modified:  Wed Sep 16 17:09:19 PDT 1998
>Originator:     Archie Cobbs
>Release:        FreeBSD 2.2.6-RELEASE i386
>Organization:
Whistle Communications, Inc.
>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 ?

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: fenner 
State-Changed-When: Wed Sep 16 17:08:47 PDT 1998 
State-Changed-Why:  
Fixed in rev 1.48 of if_ether.c 
>Unformatted:
