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


I followed the instructions in 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!


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


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


PING ( 56(84) bytes of data. From 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 U 0 0 0 br100 U 0 0 0 eth0 U 0 0 0 virbr0 U 0 0 0 eth0 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/ --listen-address= --except-interface=lo --dhcp-range=,static,120s --dhcp-lease-max=32 --dhcp-hostsfile=/opt/nova/networks/nova-br100.conf --dhcp-script=/opt/nova/bin/nova-dhcpbridge --leasefile-ro