On Thu, May 30, 2024 at 10:12:12PM +0000, Martin wrote:
> I am currently using a home made router with OpenBSD which is connected
> directly to my ISP's fiber router. The OpenBSD router is setup with a
> fixed IP on the WAN port and I do internal NAT etc.
>
> In about a month a new ISP is going to provide internet via the fiber
> and they are changing the equipment.
>
> What they have told me is that in order to use my own router, the
> router has to support VLAN tagging.
>
> The statement I got was:
>
> "We send traffic out on VLAN 100 so your router needs to be tagged to
> 100. Then all it has to do is to get an IP via DHCP."
>
> I have not done any VLAN stuff before and I am unsure exactly how to do
> this.
>
> Is this possible and how exactly is that done?
>
> Thanks.
>
Keeping it simple (change re1 to whatever is relevant in your case):
# cat /etc/hostname.re1
up
# cat /etc/hostname.vlan100
vnetid 100 parent re1
inet autoconf
up
So, in summary, (1) make sure the physical interface comes up and (2)
create a VLAN interface, with 100 as the VLAN number, the physical
interface as its parent. The rest is the same as for any other
interface (inet autoconf and up).
Incidentally, I am running this with an ISP that also provides VoIP over
VLAN 101, which I don't want to filter, rather sending it straight to
the VoIP phone they provided (which gets configured via DHCP). I
achieved this by
(1) creating an interface on VLAN 101, with the external physical
interface as the parent:
# cat /etc/hostname.vlan1010 <- the extra 0 at the end is not a typo
vnetid 101 parent re1
up
(2) creating another interface on the same VLAN, but with an internal
interface as the parent:
# cat /etc/hostname.vlan1011 <- note the extra 1 at the end
vnetid 101 parent re2
up
(3) bridging them together
# cat /etc/hostname.veb101
add vlan1010
add vlan1011
up
