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Re: Allocating dynamic IP to the VMs

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The basic troubleshooting steps for L3 mapping are :
1. make sure your DNAT/SNAT entries have been populated correctly (using 'iptables -t nat -L -n ) 2. monitor your qg-XXXXX interface making sure SNAT is working properly (using 'tcpdump -i qg-XXXX -nn) and checking that you actually have *two* TCP requests with the same id (the first one with the private IP, the second one with the public IP) 3. make sure you activated ip_forward in /etc/sysctl.conf and either reboot or sysctl -w the value (and restart quantum-l3-agent in this case)
If these 3 steps are OK, then you have a gateway issue, not related to Quantum. 

-Sylvain

Le 24/03/2013 15:49, Chathura M. Sarathchandra Magurawalage a écrit :

Thanks Sylvain,
I have tried this, but does not seem to work. I can allocate the floating ip to the VM but it is not accessible from the physical network. I can not ping to it from the controller or any other physical nodes. 

Any idea?
On 19 March 2013 16:14, Sylvain Bauza <sylvain.bauza@xxxxxxxxxxxx <mailto:sylvain.bauza@xxxxxxxxxxxx>> wrote: 

    As per
    http://docs.openstack.org/folsom/openstack-network/admin/content/demo_logical_network_config.html
    but slightly modified as per CLI help,

    quantum net-create ext_net --tenant-id $TENANT_ID --router:external=True
    quantum subnet-create --ip_version 4 --allocation-pool start=192.168.2.151,end=192.168.2.240 \
      --gateway 192.168.2.253 <id_of_ext_net>192.168.2.0/24  <http://192.168.2.0/24>  -- --enable_dhcp=False


    It will create ext_net subnet with preallocated IP range. For each
    VM, allocate floating IP from this pool and then associate it with
    the internal port.

    Hope it can helps,
    -Sylvain

    Le 19/03/2013 13:44, Chathura M. Sarathchandra Magurawalage a écrit :

    Thanks.

    its 192.168.2.0/24 <http://192.168.2.0/24>

    free ip range: 192.168.2.151 192.168.2.240

    gw/dhcp server: 192.168.2.253


    On 19 March 2013 08:28, Sylvain Bauza <sylvain.bauza@xxxxxxxxxxxx
    <mailto:sylvain.bauza@xxxxxxxxxxxx>> wrote:

        In that case, please refer to my previous e-mail : use
        floating IPs bound to the same physical network.
        That's up to you to know which IP pools are available inside
        your network. Once you get one, create a external Quantum
        subnet defined with this IP range.

        Sorry, I have feeling to explain again and again. If you
        still don't catch the point, could you please then tell me
        your physical net/CIDR, your free IP range and your gateway,
        and I'll mix you up the command to issue.

        -Sylvain

        Le 18/03/2013 18:02, Chathura M. Sarathchandra Magurawalage a
        écrit :

        Thanks Sylvain,

        There must be a way of doing this without having to do
        anything with my default gateway of my physical network? .
        Even if I have to I do not wan to do anything to the
        physical gateway. All I need is a way to let the VMs get a
        dynamic IP from the physical network. How can I do this. For
        example this can be done on virtual box using a bridge
        adapter which maps the VM in to the physical network.

        On 18 March 2013 16:05, Sylvain Bauza
        <sylvain.bauza@xxxxxxxxxxxx
        <mailto:sylvain.bauza@xxxxxxxxxxxx>> wrote:

            Could you please tell me your "physical network" CIDR ?
            Anyway, what you need is not requiring having a floating
            IP pool inside the same network, you can also play with
            static routing : if your physical host does have a
            default gw, you can create a static route from this gw
            to the VM network gateway. And on the VM network
            gateway, do the same...

            -Sylvain

            Le 18/03/2013 16:53, Chathura M. Sarathchandra
            Magurawalage a écrit :

            Hey Sylvain,

            Basically what I need is to have the VMs mapped to my
            physical network so that my physical hosts can directly
            access the VMs. How can I do this?

            Thanks.


            On 18 March 2013 15:50, Sylvain Bauza
            <sylvain.bauza@xxxxxxxxxxxx
            <mailto:sylvain.bauza@xxxxxxxxxxxx>> wrote:

                Hi,

                I don't understand your business. Should you have a
                192.168.1.0/24 <http://192.168.1.0/24> network for
                management, you could also assign an external
                network with Quantum based on the same subnet (ie.
                192.168.1.0/24 <http://192.168.1.0/24>).
                When creating a floating IP pool, Quantum does
                require at least 3 things :
                 - the CIDR
                 - the beginning and ending IPs
                 - the external gateway

                So, based on what I previously said, you only need
                to create a 192.168.1.0/24 <http://192.168.1.0/24>
                in Quantum with .1-.100 (for example) as the range,
                .254 being the external gateway.

                Thanks,
                -Sylvain

                Le 18/03/2013 16:29, Chathura M. Sarathchandra
                Magurawalage a écrit :

                anyone?

                On 17 March 2013 21:33, Chathura M. Sarathchandra
                Magurawalage <77.chathura@xxxxxxxxx
                <mailto:77.chathura@xxxxxxxxx>> wrote:

                    After reading a little bit more, I think I
                    have found what I need. It is  a provider
                    network that I need for the VMs so that they
                    can get access to the other resources in my
                    main network ( such as other physical hosts
                    that are connected to the same network ).

                    My question is, is it possible to do this
                    alongside the use case that I have followed (
                    Provider router with private networks)?

                    If so how can I do this?

                    Thanks.


                    On 16 March 2013 01:46, Chathura M.
                    Sarathchandra Magurawalage
                    <77.chathura@xxxxxxxxx
                    <mailto:77.chathura@xxxxxxxxx>> wrote:

                        Hello,

                        I want to know how I can allocate a
                        dynamic IP to the VM from the same network
                        as the openstack hosts
                        (controller/network-node/compute node)
                        network/management network . For example,
                        in virtual box you can give your VM an IP
                        from the host's network using a Bridge
                        adapter. How can I do this in openstack?

                        From what I understand floating IP's are
                        used when you have a public IP
                         (which is static) to be allocated to VM's.
                        My openstack installation architecture:
                        http://docs.openstack.org/folsom/basic-install/content/basic-install_architecture.html

                        Quantum use case:
                        http://docs.openstack.org/trunk/openstack-network/admin/content/use_cases_single_router.html





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