I currently have a multi node installation of openstack grizzly running with Ubuntu 12.04 LTS. Quantum use case that i have used is "Per-tenant Routers with Private Networks".

I have one Cirros with two nic, one for private tenant network and one for ext_net.

Private network works but i cannot ping ext_net gateway (my public gateway).

Does anyone know why ?

Compute Node - Route Table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.170.0.1      0.0.0.0         UG    100    0        0 eth0
10.170.0.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1

Compute Node - Network CFG

# The primary network interface
auto eth0
iface eth0 inet static
        address 10.170.0.10
        netmask 255.255.255.0
        network 10.170.0.0
        broadcast 10.170.0.255
        gateway 10.170.0.1
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 10.170.0.1

auto eth1
iface eth1 inet static
        address 192.168.0.10
        netmask 255.255.255.0

Network Node - Route Table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         XX.YY.ZZ.1     0.0.0.0         UG    100    0        0 br-ex
10.170.0.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
XX.YY.ZZ.0     0.0.0.0         255.255.255.0   U     0      0        0 br-ex
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1

Network Node - Network CFG

# The primary network interface
auto eth0
iface eth0 inet static
        address 10.170.0.15
        netmask 255.255.255.0
        network 10.170.0.0
        broadcast 10.170.0.255
#       gateway 10.170.0.1
        # dns-* options are implemented by the resolvconf package, if installed
#       dns-nameservers 10.170.0.1

auto eth1
iface eth1 inet static
        address 192.168.0.15
        netmask 255.255.255.0


# The public network interface adapted for OpenStack bridge br-ex
auto eth2
iface eth2 inet manual
        up ip address add 0/0 dev $IFACE
        up ip link set $IFACE up
        down ip link set $IFACE down

# OpenStack external bridge
auto br-ex
iface br-ex inet static
        address MY-PUBLIC-IP
        netmask 255.255.255.0
        gateway MY-PUBLIC-GATEWAY
        dns-nameservers 8.8.8.8