From owner-freebsd-bugs  Sun Mar 10 10: 8:25 2002
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Date: Sun, 10 Mar 2002 18:08:21 +0000
From: David Malone <dwmalone@maths.tcd.ie>
To: Peter Kieser <peter@striked.net>
Cc: freebsd-bugs@FreeBSD.org
Subject: Re: i386/35726: Won't let me use ifconfig on the interfaces after upgrade to latest OS
Message-ID: <20020310180821.GA88768@walton.maths.tcd.ie>
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On Sun, Mar 10, 2002 at 09:40:02AM -0800, Peter Kieser wrote:

Ahhh - I think I see the problem. You are trying to set up two IP
addresses on the same subnet with the same subnet mask. This has
always been unsupported in FreeBSD (because of the complication it
causes when chosing a source address), but something has started
enforcing it more vigerously in recent times.

Usually, this occurs with people setting up lots of aliases on
an ethernet card, and the correct solution is to set the subnet
mask to 255.255.255.255 for everthing but the primary address.

This could be more difficult for you 'cos you're using dhcp. I'm
not sure what the best workaround is...

	David.

>  haven# ifconfig
>  lnc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>          inet6 fe80::250:56ff:fe50:b495%lnc0 prefixlen 64 scopeid 0x1
>          ether 00:50:56:50:b4:95
>  lnc1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>          inet6 fe80::250:56ff:fe50:b496%lnc1 prefixlen 64 scopeid 0x2
>          inet 24.82.66.245 netmask 0xfffffc00 broadcast 24.82.67.255
>          ether 00:50:56:50:b4:96
>  
>  haven# /sbin/dhclient lnc1 lnc0
>  ifconfig: ioctl (SIOCAIFADDR): File exists
>  dhclient: New IP Address(lnc0): 24.82.66.238
>  dhclient: New Subnet Mask (lnc0): 255.255.252.0
>  dhclient: New Broadcast Address(lnc0): 24.82.67.255
>  dhclient: New Routers: 24.82.64.1

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