Date: Thu, 23 Apr 1998 18:07:24 -0700 (PDT) From: Archie Cobbs <archie@whistle.com> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: kern/6402: another machine can change my own permanent arp table entry Message-ID: <199804240107.SAA28219@bubba.whistle.com>
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>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
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