Open Stack

Hi,Am trying to get a multi-node setup with Devstack having one controller and two compute nodes.Am able to get the vms on the controller node to ping each other, but vms on the compute node is not reachable. I have a single interface.
Please let me know what am i missing here or if any different steps are required to get it working.
local.conf on controller node is:[[local|localrc]]HOST_IP=10.21.18.30FLAT_INTERFACE=em1 LOGFILE=/opt/stack/logs/stack.sh.logADMIN_PASSWORD=adminMYSQL_PASSWORD=adminRABBIT_PASSWORD=adminSERVICE_PASSWORD=adminSERVICE_TOKEN=abcdefghijkl

# Enable LoggingLOGFILE=/opt/stack/logs/stack.sh.logVERBOSE=TrueLOG_COLOR=TrueSCREEN_LOGDIR=/opt/stack/logs
 #Enable neutron which is required by Ironic and disable nova-networkdisable_service n-netenable_service q-svcenable_service q-agtenable_service q-dhcpenable_service q-l3enable_service q-metaenable_service neutron
And local.conf on the compute node is:[[local|localrc]]HOST_IP=10.21.18.31 # change this per compute nodeFLAT_INTERFACE=em1 SCHEDULER=nova.scheduler.simple.SimpleSchedulerMULTI_HOST=1LOGFILE=/opt/stack/logs/stack.sh.log
ADMIN_PASSWORD=adminMYSQL_PASSWORD=adminRABBIT_PASSWORD=adminSERVICE_PASSWORD=adminSERVICE_TOKEN=abcdefghijklDATABASE_TYPE=mysqlSERVICE_HOST=10.21.18.30MYSQL_HOST=10.21.18.30RABBIT_HOST=10.21.18.30MULTI_HOST=TrueGLANCE_HOSTPORT=10.21.18.30:9292Q_HOST=10.21.18.30MATCHMAKER_REDIS_HOST=10.21.18.30 disable_all_servicesenable_service rabbitenable_service n-cpuenable_service q-agt

As it is mentioned in a link  "devstack by default configures openvswitch to use GRE tunnels for tenant networks, and creates the br-int integration bridge if it doesn't already exist. Therefore, as before, no manual bridge creation is necessary to run openvswitch in single-node or multi-node configuration on systems that support OVS GRE tunneling. Regards,srindu
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