Date: Sat, 21 Oct 2000 17:59:52 +0400 (MSD) From: yar@comp.chem.msu.su To: FreeBSD-gnats-submit@freebsd.org Subject: kern/22185: Identical IP addresses on two broadcast interfaces Message-ID: <200010211359.e9LDxqf00443@yar.chem.msu.su>
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>Number: 22185 >Category: kern >Synopsis: Identical IP addresses on two broadcast interfaces >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Sat Oct 21 07:10:01 PDT 2000 >Closed-Date: >Last-Modified: >Originator: Yar Tikhiy >Release: FreeBSD 4.1-STABLE i386 >Organization: Moscow State University >Environment: The bug seems to exist in all branches. >Description: It's possible to add two absolutely identical IP addresses to two different broadcast interfaces. I guess it would be possible to add different addresses from the same network, too. The problem arises from in_control()/in_ifinit() leaving the address installed even if adding the link-layer route fails. >How-To-Repeat: yar# ifconfig fxp0 10.1.1.1 yar# ifconfig fxp1 10.1.1.1 ifconfig: ioctl (SIOCAIFADDR): File exists yar# ifconfig fxp0 fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 inet 10.1.1.1 netmask 0xff000000 broadcast 10.255.255.255 ether 00:d0:b7:60:63:da media: autoselect (100baseTX) status: active supported media: autoselect 100baseTX <full-duplex> 100baseTX 10baseT/UT P <full-duplex> 10baseT/UTP yar# ifconfig fxp1 fxp1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 inet 10.1.1.1 netmask 0xff000000 broadcast 10.255.255.255 ether 00:a0:c9:66:67:4d media: autoselect (100baseTX) status: active supported media: autoselect 100baseTX <full-duplex> 100baseTX 10baseT/UT P <full-duplex> 10baseT/UTP >Fix: Maybe, the code should try to add the link layer route first, and assign the address to the interface only if adding the route succeeded? >Release-Note: >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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