instances can't ping outside

asked 2015-03-10 10:45:17 -0600

ivica gravatar image

Hey all,

I'm aware that this question was asked many times but...bear with me please. My network configuration looks like this: . is my LAN network (my PC is connected to it) is a subnet I created using Openstack dashboard.

Router1 has interface on network active, while gateway interface is DOWN. Every service is up and running with no errors in logs.

My deployment consists of 3 servers following the official centos 7 install guide for juno: (

This is OVS-VSCTL output

 ovs-vsctl show
    Bridge br-int
        fail_mode: secure
        Port br-int
            Interface br-int
                type: internal
        Port "qr-4856ff41-2d"
            tag: 3
            Interface "qr-4856ff41-2d"
                type: internal
        Port "tap69ce898f-47"
            tag: 4095
            Interface "tap69ce898f-47"
                type: internal
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
        Port "qr-a3efb45d-b0"
            tag: 1
            Interface "qr-a3efb45d-b0"
                type: internal
        Port "tap6344f8e2-f7"
            tag: 3
            Interface "tap6344f8e2-f7"
                type: internal
        Port int-br-ex
            Interface int-br-ex
                type: patch
                options: {peer=phy-br-ex}
    Bridge br-ex
        Port phy-br-ex
            Interface phy-br-ex
                type: patch
                options: {peer=int-br-ex}
        Port "qg-bb37d248-47"
            Interface "qg-bb37d248-47"
                type: internal
        Port "eth2"
            Interface "eth2"
        Port br-ex
            Interface br-ex
                type: internal
        Port "qg-0eec4ee3-cf"
            Interface "qg-0eec4ee3-cf"
                type: internal
    Bridge br-tun
        Port br-tun
            Interface br-tun
                type: internal
        Port "gre-0a00011f"
            Interface "gre-0a00011f"
                type: gre
                options: {df_default="true", in_key=flow, local_ip="", out_key=flow, remote_ip=""}
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
    ovs_version: "2.1.3"

ip route output

ip route
default via dev eth0 dev eth1  proto kernel  scope link  src dev eth0  proto kernel  scope link  src dev br-ex  proto kernel  scope link  src

ifcfg-br-ex interface


ifcfg-eth2 interface

NAME=System eth2

Instances can ping each other but are unable to ping which is the default gateway for ext-net. If you need any more info, please ask, I'll be happy to provide it.

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Check that your router namespace has both network connections created, On your controller, use: $ ip netns To see all of the namespaces $ ip netns exec <qrotuer-uuid> ip a This will list the network interfaces in that particular namespace, you should see and interface on each network.

jdexter gravatar imagejdexter ( 2015-03-12 13:09:17 -0600 )edit

are you using nova-network or neutron?

omar-munoz gravatar imageomar-munoz ( 2015-03-12 15:42:55 -0600 )edit