From owner-freebsd-net@FreeBSD.ORG  Sun May  8 16:54:27 2005
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Date: Sun, 08 May 2005 18:54:19 +0200
From: Michael Bretterklieber <mbretter@inode.at>
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Subject: Multiple Interfaces with the same IP
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Hi,

it looks like that under 5-stable it's allowed to have different 
interfaces with the same IP, bug or feature?

bash-2.05b# ifconfig ath0 inet 192.168.201.12 netmask 0xffffff00 up
bash-2.05b# ifconfig sk0 inet 192.168.201.12 netmask 0xffffff00 up
bash-2.05b# ifconfig
ath0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         inet6 fe80::20f:b5ff:fe1e:ce12%ath0 prefixlen 64 scopeid 0x1
         inet 192.168.201.12 netmask 0xffffff00 broadcast 192.168.201.255
         ether 00:0f:b5:1e:ce:12
         media: IEEE 802.11 Wireless Ethernet autoselect mode 11b 
(DS/11Mbps)
         status: associated
         ssid xx 1:xx
         channel 11 authmode OPEN powersavemode OFF powersavesleep 100
         rtsthreshold 2312 protmode CTS
         wepmode MIXED weptxkey 1
         wepkey 1:104-bit
sk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         inet6 fe80::20f:eaff:fe3a:7058%sk0 prefixlen 64 scopeid 0x2
         inet 192.168.201.12 netmask 0xffffff00 broadcast 192.168.201.255
         ether 00:0f:ea:3a:70:58
         media: Ethernet autoselect (100baseTX <full-duplex,flag0,flag1>)
         status: active


thanx,
bye,
Michael