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do you see sent and received packets on the vlan?  I would suspect that you actually don't have the vlans trunked on the ports so the packets aren't making it across the switch.

Vish

On May 31, 2012, at 9:53 AM, Vijay wrote:

> Thanks for the reply. Network controller assigns a private ip address to the vm launched on compute node. However, I still cannot ping this ip address from the network(controller node). I am running nova-network service only on the controller.
>  
> Thanks,
> -vj
> From: Narayan Desai <narayan.desai at gmail.com>
> To: Vijay <vijayrg at yahoo.com> 
> Cc: "openstack at lists.launchpad.net" <openstack at lists.launchpad.net> 
> Sent: Wednesday, May 30, 2012 5:28 PM
> Subject: Re: [Openstack] dhcp is not leasing an ip address in vlan mode
> 
> This sounds like it might be working properly. In VLAN mode, all
> instances are connected to one of the project vlans. The .1 address
> (gateway, dhcp, etc) exists on an interface on the nova-network node
> (or one of them, in the case that you are running multiple. This
> interface is bridged to a tagged interface on the appropriate vlan
> tag. On the nova-compute nodes, a vnet interface for the instance is
> bridged to the vlan tagged interface. On the compute node, there isn't
> an IP interface on this network, so the private IP for instances isn't
> reachable, even if the instance is running on the same node.
> 
> The canonical test for correct network function is if an instance is
> reachable via ping from the nova-network server that is currently
> serving the instance's project network.
> hth
> -nld
> 
> On Wed, May 30, 2012 at 5:42 PM, Vijay <vijayrg at yahoo.com> wrote:
> > Hello,
> > I am trying install Essex in VLAN mode on multiple compute nodes.
> >
> > I am able to lauch instances on controller (which also runs nova-compute)
> > and ping/ssh those instances.
> > I am able to launch instances on compute only node. However, I cannot ping
> > the VM launched  on compute only node.
> > When i did the euca-get-console-output on that instance, I see that it is
> > not getting an IP leased from DHCP .. Because of that it is not able to
> > reach metadata server.
> > Any help is appreciated.
> >
> > Console output is
> > udhcpc (v1.17.2) started
> > Sending discover...
> > Sending discover...
> > Sending discover...
> > No lease, forking to background
> > starting DHCP forEthernet interface eth0  [  OK  ]
> > cloud-setup: checking
> > http://169.254.169.254/2009-04-04/meta-data/instance-id
> > wget: can't connect to remote host (169.254.169.254): Network is unreachable
> > cloud-setup: failed 1/30: up 17.71. request failed
> > nova.conf:
> > --dhcpbridge_flagfile=/etc/nova/nova.conf
> > --dhcpbridge=/usr/local/bin/nova-dhcpbridge
> > --logdir=/var/log/nova
> > --state_path=/var/lib/nova
> > --lock_path=/var/lock/nova
> > --force_dhcp_release=True
> > --use_deprecated_auth
> > --iscsi_helper=tgtadm
> > --verbose
> > --vncserver_listen=0.0.0.0
> > --sql_connection=mysql://novadbadmin:novasecret@192.168.198.85/nova
> > --daemonize
> > --s3_host=192.168.198.85
> > --rabbit_host=192.168.198.85
> > --cc_host=192.168.198.85
> > --ospi_host=192.168.198.85
> > --ec2_host=192.168.198.85
> > --ec2_url=http://192.168.198.85:8773/services/Cloud
> > --nova_url=http://192.168.198.85:8774/v1.1/
> >
> > # VLAN mode
> > --flat_interface=eth1
> > --flat_injected=False
> > --flat_network_bridge=br100
> > --flat_network_dhcp_start=192.168.4.2
> >
> > --network_manager=nova.network.manager.VlanManager
> > --vlan_interface=eth1
> > --public_interface=vlan100
> > --allow_same_net_traffic=True
> > --fixed_range=192.168.4.0/24
> > --network_size=256
> > --FAKE_subdomain=ec2
> > --routing_source_ip=192.168.198.85
> > --glance_api_servers=192.168.198.85:9292
> > --image_service=nova.image.glance.GlanceImageService
> > --iscsi_ip_prefix=192.168.
> > --connection_type=libvirt
> > --libvirt_type=qemu
> >
> > # Keystone
> > --auth_strategy=keystone
> > --api_paste_config=/etc/nova/api-paste.ini
> > --keystone_ec2_url=http://192.168.198.85:5000/v2.0/ec2tokens
> >
> >
> >
> >
> > Thanks,
> > -vj
> >
> > _______________________________________________
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> > Post to     : openstack at lists.launchpad.net
> > Unsubscribe : https://launchpad.net/~openstack
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> >
> 
> 
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