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2018-02-05 03:42:52 -0500 commented question provider network vlan external dhcp

Hi,

I haven’t played with it for a while. Did you find a solution for this?

Cheers, Oli

2017-11-21 07:10:14 -0500 commented question Provider Network DHCP

Hi Bernd, thanks a lot for your quick answer and sorry for my late reply. So this means I can use both DHCPs? The messages are only informational and dnsmasq will not handle the requests from non openstack instances?

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2017-11-14 14:23:13 -0500 asked a question provider network vlan external dhcp

Hi all,

I come from a vSphere environment with DVS. I tested an openstack deployment using RDO packstack and was able to create a network setup similar to vSphere but now I'm stuck because we already have a Windows DHCP server on our provider network and I don't want the dnsmasq to interfere with it.

I have deployed a 4 node (1 controller + 3 compute) setup. On all nodes 2 10Gb nics are bonded to bond0 which is then mapped to br-ex. For testing I created a network and a subnet with DHCP enabled and allocated a range of free IPs that is excluded from the existing Windows DHCP. Using this I can deploy instances that can reach machines on the same vlan outside of openstack just fine by adjusting the security group.

I thought this dnsmasq DHCP is somehow isolated so that only instances can reach it but in /var/log/messages I can see that all sorts of machines on the same provider vlan reach it to:

Nov 14 15:32:53 gedaspl03 dnsmasq-dhcp[6116]: DHCPREQUEST(tapf01d75bb-1e) 172.28.19.178 00:50:56:b7:38:81
Nov 14 15:32:53 gedaspl03 dnsmasq-dhcp[6116]: DHCPNAK(tapf01d75bb-1e) 172.28.19.178 00:50:56:b7:38:81 lease not found

So I stopped my test for now as I don't think it is good to have more then one DHCP. :P I'm now wondering If a setup similar to vSphere is even possible?

My question is, can I simply ignore the messages regarding dnsmasq because it is really somehow isolated and only instances will get IPs or do I have to use tenant networks with routers and floating IPs?

Best Regards, Oliver

2017-11-14 14:23:13 -0500 asked a question Provider Network DHCP

Hi all,

I come from a vSphere environment and started to test openstack. I deployed 4 Nodes ( 1 Controller + 3 Compute) using packstack and I managed to setup networking similar to vSphere by using VLANs. So the openstack controller node and Compute nodes are connected via br-ex:bond0 using vlans to our existing network. Of course there are already DNS and DHCP servers on this network (all windows based). By creating the subnets in neutron I first disabled DHCP but If I recall correctly this is necessary for the instances to use cloud-init. So for testing I enabled the DHCP and allocated a few free IPs which are excluded from our Windows DHCP. I thought maybe the DHCP (dnsmasq) is somehow isolated and only accepts DHCP requests from instances but looking at /var/log/messages I can see all machines can reach the DHCP on the openstack network controller:

Nov 13 13:15:02 gedaspl03 dnsmasq-dhcp[6116]: DHCPREQUEST(tapf01d75bb-1e) 172.28.19.65 00:50:56:b7:0f:36 Nov 13 13:15:02 gedaspl03 dnsmasq-dhcp[6116]: DHCPNAK(tapf01d75bb-1e) 172.28.19.65 00:50:56:b7:0f:36 lease not found

So far no non openstack machines have acquired any of the pre allocated IPs from dnsmasq yet. Is it possible to have dnsmasq running besides other DHCP servers?