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From: Garrett Cooper <yanegomi@gmail.com>
Date: Mon, 19 Dec 2011 08:36:06 -0800
To: Dimitry Andric <dim@FreeBSD.org>
Cc: freebsd-current <freebsd-current@FreeBSD.org>,
	Doug Barton <dougb@FreeBSD.org>
Subject: Re: r228700 can't dhclient em0
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On Dec 19, 2011, at 5:24 AM, Dimitry Andric <dim@FreeBSD.org> wrote:

> On 2011-12-19 10:17, Doug Barton wrote:
>> I updated to r228700 from 228122 and dhclient exits immediately saying
>> that em0 doesn't exist. However ifconfig seems to disagree:
>>=20
>>=20
>> em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST>  metric 0 mtu 1=
500
>>=20
>> options=3D4219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WO=
L_MAGIC,VLAN_HWTSO>
>>         ether 00:24:e8:30:10:9b
>>         nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>>         media: Ethernet autoselect (100baseTX<full-duplex>)
>>         status: active
>> lo0: flags=3D8049<UP,LOOPBACK,RUNNING,MULTICAST>  metric 0 mtu 16384
>>         options=3D3<RXCSUM,TXCSUM>
>>         nd6 options=3D21<PERFORMNUD,AUTO_LINKLOCAL>
>>=20
>>=20
>> Interestingly, some of the options are different in that version, vs.
>> the working version:
>>=20
>> em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST>  metric 0 mtu 1=
500
>>    options=3D219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,=
WOL_MAGIC>
>>    ether 00:24:e8:30:10:9b
>>    inet 172.17.198.245 netmask 0xffff0000 broadcast 172.17.255.255
>>    nd6 options=3D29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>>    media: Ethernet autoselect (100baseTX<full-duplex>)
>>    status: active
>=20
> I saw this too, when my kernel and userland were out of sync (e.g. just
> after installing a new kernel, and before installworld).  I suspect it
> is caused by the changes in r228571, which cause old ifconfig and
> dhclient to not recognize any interfaces.  I'm not 100% sure though.

This makes sense because the structs that describe addresses changed recentl=
y.
-Garrett=