Re: vlan with its own ether / mac address?
From: Brooks Davis (brooks_at_one-eyed-alien.net)
Date: 02/13/04
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Date: Fri, 13 Feb 2004 12:58:16 -0800 To: Bjorn Eikeland <bjorn@eikeland.info>
On Fri, Feb 13, 2004 at 09:30:31PM +0100, Bjorn Eikeland wrote:
> is it possible to set up a vlan device with its own ether address?
> I've tried the following:
>
> ifconfig vlan0 create
> ifconfig vlan0 vlan 1 vlandev fxp0 up
> ifconfig vlan0 inet 10.0.0.10 netmask 255.255.255.0 \
> ether 00:a0:c9:f1:4e:6e
> ifconfig: ether: bad value
>
> but changing the ether value after the device is up 'works',
> but caused me to only have access to the vlan ip.
>
> my existing fxp0 device
> fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> inet 10.0.0.2 netmask 0xff000000 broadcast 10.255.255.255
> ether 00:a0:c9:f1:4e:6d
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
>
> the faked vlan0 device:
> vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
> inet 10.0.0.10 netmask 0xffffff00 broadcast 10.0.0.255
> ether 00:a0:c9:f1:4e:6e
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> vlan: 1 parent interface: fxp0
You might try putting the interface in promisc mode. I'm not sure that
will be sufficent, but it might be. I suspect the problem is likely to
be that the recieve filter on many NICs only supports two modes promisc
and self+broadcast. You want a mode where you get
self1+self2+broadcast. Some multicast filters probably do support this.
> basically I'm trying to set up dhcp to configure unknown hosts
> in a seperate network to allow them to register their mac address
> and then be allocated a ip in the "real" network. And need a way
> to test with several clients, but I've only got one nic in my box.
You might be able to create virtual ethernet interfaces via tap(4) and
then bridge them.
-- Brooks
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