> On 7 Dec 2018, at 12:32, mabi <m...@protonmail.ch> wrote:
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Friday, December 7, 2018 11:43 AM, Mischa <obs...@high5.nl> wrote:
>
>> It might be as easy as adding: up
>>
>> cat /etc/hostname.bridge6
>>
>> ==========================
>>
>> add vlan6
>> up
>>
>> By default the bridge interface is not brought up.
>> You can also run: ifconfig bridge6 up
>
> Good idea and I added "up" to my hostname.bridge6 file but it looks like it
> was already up (at least by doing an ifconfig bridge6 shows the "UP" flag).
> Neverthless to be on the safe side I rebooted the server but still not
> connectivity on the vlan6/bridge6 network for the VMs.
>
> On the bridge6 interface I can see the DHCP request with tcpdump when the
> OpenBSD installer in the VM tries to fetch an IP address with DHCP:
>
> 11:59:35.672258 0.0.0.0.68 > 255.255.255.255.67: xid:0xbafb375b [|bootp]
> [tos 0x10]
>
> Then on the DHCP server I can see the following in loop:
>
> Dec 7 12:00:27 dhcpsrv dhcpd[18917]: DHCPDISCOVER from fe:e1:bb:01:01:01 via
> XXX.XXX.XXX.1
> Dec 7 12:00:27 dhcpsrv dhcpd[18917]: DHCPOFFER on XXX.XXX.XXX.101 to
> fe:e1:bb:01:01:01 via XXX.XXX.XXX.1
>
> The IP address ending with .1 is the gateway on my public network and the one
> ending with .101 is the IP which should be assigned to my OpenBSD VM.
>
> It seems like the traffic is not flowing back to the VM itself.
>
> I just found a very interesting behaviour by running tcpdump on pretty much
> all interfaces of my server to analyze the traffic at different levels and
> BINGO: as soon as I run tcpdump on my trunk0 interface the DHCP request goes
> through and my VM has network connectivity! But as soon as I stop tcpdump on
> the trunk interface: no more network connectivity...
>
> Now as far as I know running tcpdump enables promiscous mode (PROMISC flag on
> the interface) and this should the reason why it works.
>
> But now what does it mean for my setup, do I need to enable promiscuous mode
> on my trunk interface manually? and if yes how can I do that?
>
The VLAN does require an IP address as far as I am aware.
Mischa
