Hi all,

I have installed RDO all-in-one on a CentOS 7 (VirtualBox VM hostname "rhino.stack"). I have been able to create cirros instances, assign floating IPs to the instances, and connect to them from the all-in-one host rhino.stack. I can access the public net just fine from the all-in-one host rhino.stack.

My problem is that I cannot connect from the instances to the public net. I have traced this to a connection problem between my OVS router and the external bridge "br-ex": The external port on the router reports being "DOWN". I also notice that no TAP device has been created for the the external bridge when I set the gateway for my router. I believe this is the underlying problem. Can anybody help me debug this setup and find out, why the TAP device does not get created?

I have two NICs on the all-in-one host: enp0s3 is a NAT interface provided by VirtualBox (IP 10.0.2.102 GW 10.0.2.2, for accessing the public net) and enp0s8 is an access-interface (IP 172.241.0.103), so that I can ssh from my laptop to to rhino.stack VirtuanBox VM).

This is my configuration:

Interface setup

  [root@rhino ~(keystone_admin)]# cat /etc/sysconfig/network-scripts/ifcfg-br-ex
DEVICE=br-ex
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
IPADDR=10.0.2.102
NETMASK=255.255.255.0 
GATEWAY=10.0.2.2
DNS1=8.8.8.8 
ONBOOT=yes
[root@rhino ~(keystone_admin)]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
# ifcfg-enp0s3
DEVICE=enp0s3
TYPE=OVSPort
DEVICETYPE=ovs
OVS_BRIDGE=br-ex
HWADDR="08:00:27:73:58:2b"
ONBOOT=yes

"ovs-vsctl show" OVS and ifconfig

[root@rhino ~(keystone_admin)]# ovs-vsctl show
a7f15c8d-38d7-4a9d-a05d-1b9315197764
    Bridge br-int
        fail_mode: secure
        Port br-int
            Interface br-int
                type: internal
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
    Bridge br-tun
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
        Port br-tun
            Interface br-tun
                type: internal
    Bridge br-ex
        Port "enp0s3"
            Interface "enp0s3"
        Port br-ex
            Interface br-ex
                type: internal
        Port "qg-d392c190-3f"
            Interface "qg-d392c190-3f"
                type: internal
    ovs_version: "2.1.3"

[root@rhino ~(keystone_admin)]# ifconfig
br-ex: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.0.2.102  netmask 255.255.255.0  broadcast 10.0.2.255
        inet6 fe80::b058:50ff:fee4:814f  prefixlen 64  scopeid 0x20<link>
        ether 08:00:27:73:58:2b  txqueuelen 0  (Ethernet)
        RX packets 97  bytes 7894 (7.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 99  bytes 9044 (8.8 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

br-int: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::5001:3ff:fe00:b44d  prefixlen 64  scopeid 0x20<link>
        ether 52:01:03:00:b4:4d  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 8  bytes 648 (648.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::a00:27ff ...