Issue While Associating Floating IPs

HI ,

I have setup nova in my local environment.all the services are running. Am able to launch instance, but am not able to associate Floating IP to the instance.

My nova-network.log
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http://paste.openstack.org/show/2362/

Nc.Config
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--dhcpbridge_flagfile=/etc/nova/nova.conf
--dhcpbridge=/usr/bin/nova-dhcpbridge
--logdir=/var/log/nova
--state_path=/var/lib/nova
--verbose
--s3_host=172.16.1.12
--rabbit_host=172.16.1.12
--ec2_api=172.16.1.12
--cc_host=172.16.1.12
--ec2_url=http://172.16.1.12:8773/services/Cloud
--fixed_range=10.0.0.0/8
--network_size=8
--FAKE_subdomain=ec2
--routing_source_ip=172.16.1.12
--sql_connection=mysql://root:root@172.16.1.12/nova
--network_manager=nova.network.manager.FlatManager
--lock_path=/var/lib/nova/tmp

My Network
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# The loopback network interface
            auto lo
            iface lo inet loopback

# The primary network interface
             auto br100
            iface br100 inet static
            bridge_ports eth0
            bridge_stp off
            bridge_maxwait 0
            bridge_fd 0
            address 172.16.1.12
            netmask 255.255.255.0
            network 172.16.1.0
            broadcast 172.16.1.255
            gateway 172.16.1.1
            # dns-* options are implemented by the resolvconf package, if installed
            dns-nameservers 75.75.75.75