Hi,
I'm wondering if it's possible to get OpenBSD to make the NIC ports act
like a layer 2 switch?
I made a quick test in VirtualBox (unfortunately I don't have any bare
bones systems free to test with) and tried the following:
create two systems, one called router , the other called client
create vlans: vlan1, vlan2, vlan3
create trunk interfaces on 3x virtual NIC's: trunk0 (em0), trunk1 (em1),
trunk2 (em2)
I then added the vlans to trunk0 by setting the vlandev to trunk0 in the
hostname.if files.
Of course a basic router-on-a-stick method like the above works fine but
if I wanted the 3 vlans to also be on the trunk1 interface in a similar
way to provisioning an L2 switch how would I go about it?
I attempted to bridge trunk0 and trunk1. The result I got was that dhcp
worked and the client was able to get an IPv4 address, I also had
multicast traffic working when dynamically sending the client routes
through OpenOSPF, as in I could see OSPFv2-hello and OSPFv2-dd packets
being sent to 224.0.0.5 .
What didn't work was ICMP packets were not being seen on the router
systems NIC when I tried to use the ping command and in addition the
OSPF routes would not propagate either.
If I changed the virtual configuration back to trunk0 then everything
worked as expected. It may just be a limitation of Vbox....?
In the meantime I have been looking at the docs:
https://www.openbsd.org/papers/bsdcan2016-switchd.pdf
https://man.openbsd.org/switch
for the switch interface but is this really what I need here?
Has anyone tried and succeeded with this kind of config?
My main reason for wanting to use something like this is that I want to
add a 10GbE NIC and switch into my production router platform while
still keeping the same setup going to the 1GbE switch which is running
in a 4-port LACP trunk.
Of course an alternate would be to link the 1GbE switch to the 10GbE
switch and do things that way, but the above would be more practical
from a cabling sense.
Has anyone got any ideas?
Thanks a lot!
Kaya
