Re: Virtual interfaces with own MACs

On Wed, Sep 26, 2018 at 1:54 PM, Per-Olov Sjöholm <pos@incedo.org> wrote:
> Hi
>
> I want to receive 2 IPs that are mine from the ISP (I have to supply 2 MACs) over DHCP. They have a problem letting me add them permanent without dhcp as their snooping blocks my connection if not using dhcp.
>
> I want to use just one physical interface as I do not have more 10Gbit interfaces to spare. Also I want to use fake virtual MAC so I can switch hardware without contacting the ISP.
>
> Is it possible in OpenBSD to create sub interfaces with different MACs on them and use dhcp for both? How?
>
> In linux I think it can be done as:
> ip link add link eth0 address 00:11:11:11:11:11 eth0.1 type macvlan
> ifconfig eth0.1 up
> dhclient -v eth0.1
> ip link add link eth0 address 00:11:11:11:11:12 eth0.2 type macvlan
> ifconfig eth0.2 up
> dhclient -v eth0.2
>
>
>
> Is it possible to something similar to
>
> /etc/hostname.ix3
> up
>
> /etc/hostname.ix3:1
> !ifconfig SUBINT VIRTUAL_NEW_MAC SUBDEV $if Public IP 1"
> !dhclient ix3:1
>
>
> /etc/hostname.ix3:2
> !ifconfig SUBINT VIRTUAL_NEW_MAC SUBDEV $if Public IP 2"
> !dhclient ix3:2
>
>
> If so… What should they look like. Note that I want to provide the ISP the virtual MACs and not the cards physical MAC…

Here is an old post of mine explaining what sounds like your exact
setup for the same reason:
http://openbsd-archive.7691.n7.nabble.com/Bridged-vether-interfaces-can-t-talk-to-each-other-multiple-routing-tables-td316937.html

I did get most of it working, but it was a long time ago and I never
used the router in "real life". I had issues communicating between the
domains. I'm not sure if those examples are good or bad but it could
be a starting point.