Date: Tue, 18 Feb 2003 11:52:22 -0600 (CST) From: Jonathan Lemon <jlemon@flugsvamp.com> To: m.seaman@infracaninophile.co.uk, Terry Todd <tlt@badger.tltodd.com>, questions@freebsd.org Subject: Re: NIC numbering Message-ID: <200302181752.h1IHqMGt067351@mail.flugsvamp.com> In-Reply-To: <local.mail.freebsd-questions/20030218173548.GB20940@happy-idiot-talk.infracaninophi> References: <local.mail.freebsd-questions/20030215082835.A34779@badger.tltodd.com> <local.mail.freebsd-questions/20030217123009.GA8983@postecom.it> <local.mail.freebsd-questions/20030217130819.GA1275@raggedclown.net> <local.mail.freebsd-questions/20030218110230.A42817@badger.tltodd.com>
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In article <local.mail.freebsd-questions/20030218173548.GB20940@happy-idiot-talk.infracaninophi> you write:
>On Tue, Feb 18, 2003 at 11:02:30AM -0600, Terry Todd wrote:
>> On Mon, Feb 17, 2003 at 02:08:19PM +0100, Cliff Sarginson wrote:
>> > On Mon, Feb 17, 2003 at 01:30:09PM +0100, Andrea Franceschini wrote:
>> > > On Sat, Feb 15, 2003 at 08:28:35AM -0600, Terry Todd wrote:
>> > > > When you have more than one of the same type of NIC card in one
>> > > > machine is there a way to insure that the NIC numbering remains
>> > > > attached to the same card / MAC address if more cards are added or
>> > > > they are moved around?
>> > > >
>>
>> Here's an example.
>>
>> The original setup:
>>
>> $ ifconfig -a
>> rl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>> ether 00:e0:29:85:49:b6
>> media: Ethernet autoselect (10baseT/UTP)
>> status: no carrier
>> rl1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>> ether 00:e0:29:85:49:d0
>> media: Ethernet autoselect (10baseT/UTP)
>> status: no carrier
>>
>> After the cards are switched around in the PCI slots:
>>
>> $ ifconfig -a
>> rl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>> ether 00:e0:29:85:49:d0
>> media: Ethernet autoselect (10baseT/UTP)
>> status: no carrier
>> rl1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>> ether 00:e0:29:85:49:b6
>> media: Ethernet autoselect (10baseT/UTP)
>> status: no carrier
>>
>> How can I keep rl0 associated with MAC 00:e0:29:85:49:b6
>> and rl1 associated with MAC 00:e0:29:85:49:d0 and still
>> be able to add cards or move them around?
>
>About the best you can do is use ifconfig(8) to set the MAC address at
>the same time as you configure the interface:
>
> ifconfig rl0 ether 00:e0:29:85:49:b6
> ifconfig rl1 ether 00:e0:29:85:49:d0
>
>which will cause the MAC address to stick with the interface number,
>rather than the actual card. That will work if you just keep the two
>cards as you've shown here, but if you add a new card that happens to
>end up as rl0 then you'll probably end up with a mess.
>
>As far as I know, there's no way of wiring down interface numbers to
>PCI bus slots, analogously to the way you can wire down SCSI devices
>by bus, target and LUN --- see the section on 'SCSI DEVICE
>CONFIGURATION' in LINT. You'ld probably have to go a bit linux-ish
>and have, say, eth0 as the generic name for an ethernet interface
>independant of the actual chipset on the NIC in order to make the most
>sense of that sort of wiring-down idea.
Actually, this capability has been in 5.0 for a long time, but I don't
think that it was ever MFC'd to 4.x. There are network aliases for the
actual physical devices, which appear as /dev/netN, where N is the
index number used. These can be wired either by name or ether number
at boot time:
Allow wiring of net aliases in /boot/device.hints of the form:
hint.net.1.dev="lo0"
or
hint.net.12.ether="00:a0:c9:c9:9d:63"
So for the original poster, you could do (in 5.0):
hint.net.1.ether="00:e0:29:85:49:b6"
hint.net.2.ether="00:e0:29:85:49:d0"
> ifconfig net1
rl1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
ether 00:e0:29:85:49:b6
media: Ethernet autoselect (10baseT/UTP)
status: no carrier
> ifconfig net2
rl0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
ether 00:e0:29:85:49:d0
media: Ethernet autoselect (10baseT/UTP)
status: no carrier
And the 'net1','net2' aliases will remain bound to whichever driver has
those actual ethernet addresses, regardless of PCI ordering.
--
Jonathan
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