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Date: Fri, 15 Sep 2000 08:19:55 -0700 (PDT)
From: Jin Guojun (DSD staff) <jin@iss-p1.lbl.gov>
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Subject: bin/21292: ifconfig warn but does duplicate IP address
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>Number:         21292
>Category:       bin
>Synopsis:       ifconfig warn but does duplicate IP address
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Sep 15 08:20:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Jin Guojun (DSD staff)
>Release:        FreeBSD 4.1-RELEASE i386
>Organization:
>Environment:

	Seen this issue in 4.1-RELEASE, but may in all releases.

	When ifconfig two NIC to have the same address, ifconfig warns
ifconfig: ioctl (SIOCAIFADDR): File exists
	but still assign the same IP to the second NIC. See Description.

>Description:

cal2 1 # ifconfig
sk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 10.0.0.2 netmask 0xffffff00 broadcast 10.0.0.255
        inet6 fe80::200:5aff:fe98:4b68%sk0 prefixlen 64 scopeid 0x2 
        ether 00:00:5a:98:4b:68 
        media: autoselect (1000baseSX <half-duplex>) status: active
        supported media: autoselect 1000baseSX <full-duplex> 1000baseSX none
sk1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 204.62.155.22 netmask 0xffffff00 broadcast 204.62.155.255
        inet6 fe80::200:5aff:fe98:e448%sk1 prefixlen 64 scopeid 0x3 
        ether 00:00:5a:98:e4:48 
        media: autoselect (1000baseSX <full-duplex>) status: active
        supported media: autoselect 1000baseSX <full-duplex> 1000baseSX none
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x4 
        inet6 ::1 prefixlen 128 
        inet 127.0.0.1 netmask 0xff000000 
cal2 2 # ifconfig sk0 204.62.155.22 netmask 0xffffff00 up
ifconfig: ioctl (SIOCAIFADDR): File exists
cal2 3 # ifconfig
sk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::200:5aff:fe98:4b68%sk0 prefixlen 64 scopeid 0x2 
        inet 204.62.155.22 netmask 0xffffff00 broadcast 204.62.155.255
        ether 00:00:5a:98:4b:68 
        media: autoselect (1000baseSX <full-duplex>) status: active
        supported media: autoselect 1000baseSX <full-duplex> 1000baseSX none
sk1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 204.62.155.22 netmask 0xffffff00 broadcast 204.62.155.255
        inet6 fe80::200:5aff:fe98:e448%sk1 prefixlen 64 scopeid 0x3 
        ether 00:00:5a:98:e4:48 
        media: autoselect (1000baseSX <half-duplex>) status: active


>How-To-Repeat:

	See Description.

>Fix:

	


>Release-Note:
>Audit-Trail:
>Unformatted:


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