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can not ping or ssh to the instance, "no route to the host"

Hi

I followed the instructions in http://wiki.openstack.org/NovaInstall/DevInstallScript. Everything seems ok, however, I've created a instance but I can not ssh nor ping. All gave me "no route to the host" error. I am providing related information here, hoping that someone can help me out since I already spent several days on this.

Please let me know if I should provide anything more.

Thanks in advance!

Haitao

Installation: OpenStack on Ubuntu 10.04 on top of the Virtual Box running under Windows 7.

euca-describe-instances

RESERVATION r-bi6s8f73 project-haitaoj default INSTANCE i-00000001 ami-2e5741a0 10.0.0.3 10.0.0.3 running project-haitaoj (project-haitaoj, haitaoj-laptop-vb) 0 m1.tiny 2011-06-14T20:10:40Z nova

ping 10.0.0.3

PING 10.0.0.3 (10.0.0.3) 56(84) bytes of data. From 10.0.0.1 icmp_seq=1 Destination Host Unreachable

cat /etc/network/interfaces

auto lo iface lo inet loopback

netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.0.0.0 0.0.0.0 255.255.255.224 U 0 0 0 br100 10.0.2.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 10.0.2.2 0.0.0.0 UG 0 0 0 eth0

ps ax | grep dnsmasq

2167 ? S 0:00 dnsmasq --strict-order --bind-interfaces --conf-file= --domain=novalocal --pid-file=/opt/nova/networks/nova-br100.pid --listen-address=10.0.0.1 --except-interface=lo --dhcp-range=10.0.0.3,static,120s --dhcp-lease-max=32 --dhcp-hostsfile=/opt/nova/networks/nova-br100.conf --dhcp-script=/opt/nova/bin/nova-dhcpbridge --leasefile-ro