Dear Jonas,

We selected Neutron with VLAN segmentation in our environment and
checked VLAN tagging tick for public network (in Fuel Master GUI). before
selecting VLAN tagging, we had the error about network conflict
("some untagged networks are assigned to the same physical
interface".). I was wondering if VLANing could be done automatically
through GUI or not*. I not, how would be the our network architecture?
Which parts of network configuration should be done manually and before
configuring network in GUI? and where? On the host for fuel master VM? The
only part we configured manually, was to set a bridge for interface eth0
and connecting the fuel master VM to that.

*I mean, I thought now the problem is the gateway and the obligation to
use that as the access point for the internet in Admin network, and also
as gateway in public network.



> Hi, to separate public network from admin network you need to have

> separate L2 broadcast domains, I.e. 2 VLANs. Otherwise the network

> will not pass.

> BR/Jonas




> [] On Behalf Of


> Sent: Saturday, September 17, 2016 7:40 AM

> To:

> Subject: [opnfv-tech-discuss] [Fuel] Problem with networking (public

> pxe network, DHCP)


> Dear all,


> We are trying to install OPNFV with Fuel (Brahmaputra). We've
recently set

> up a fuel master on a VM using ubuntu bridging and virt-manager. Now

> GUI is accessible and nodes are detected. Our problem is with

> configurations. We have just one NIC on fuel master host (which the

> br0 is assigned to) and one network interface in fuel master VM.

> nodes are on bare metals. Nodes are connected via the only gateway in

> network that is unfortunately out of our control: and a

> server is running on that!


> To assign accessible IP addresses to nodes, we had to use the same

> and gateway for public network! We tried to isolate public network

> PXE network using different CIDRs and assigning different IP ranges.

> it seems not working!

> (error detail is as follows:

> When VLAN tagging is not checked for public network, it says

> untagged networks are assigned to the same physical

> And when VLAN tagging is checked, we got DHCP error: "Node

> (a7:4f) discovered DHCP server via enp7s0 with following parameters:

>, MAC: ... This server will conflict with the


> I thought it is not obligatory to have more than one NIC on fuel

> Am I right? If yes, how should we configure our PXE and public


> The network configuration is as follows:


> We had needed to have 10.1.247.* as our public address.

> Host 1 (the VM is running on this host)

> IP: (br0 interface) , gateway: (A DHCP server

> running here. Because this node in not under our control, we cannot

> DHCP. But we need this node as gateway)

> Fuel Master: VM with IP (assigned to eth0, connected to

> gateway

> Host 2: Node1 as controller ( was assigned to it)

> Host 3: Node2 as compute ( was assigned to it)

> PXE network: mask: , Pool: -


> public network: CIDR:, IP range: -

>, gateway: (As we needed to access public

> and floating IPs externally, we had to use this gateway)


> Thanks in advance,


> Fatemeh


opnfv-tech-discuss mailing list

Reply via email to