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On 12/13/2012 12:07 PM, ZhiQiang Fan wrote:
<blockquote
cite="mid:CA+TtxktqgJp4P0o4xDgvPsZxoXnzX6ox5sKCs2xa++EpExh0dg@mail.gmail.com"
type="cite">i can ping and ssh into instance with private ip and
floating ip<br>
instance can ping the control node ip, but cannot ping the compute
node and any external network</blockquote>
<br>
In order to be able to help would it be possible that you provide IP
addresses and maybe a bit of understanding about your topology.<br>
<br>
Basically is there a route from the VM ip address to the IP address
of the compute node?<br>
<br>
In addition to this can you please let us know which plugin you are
using?<br>
<br>
Thanks<br>
Gary<br>
<blockquote
cite="mid:CA+TtxktqgJp4P0o4xDgvPsZxoXnzX6ox5sKCs2xa++EpExh0dg@mail.gmail.com"
type="cite">
<p>i have installed quantum in the control node host, and it only
got 1 nic (same as compute node), and use eth0:0 and eth0:1 to
vitualize 2 other nic (eth0:0 on compute node)</p>
<p>i use tcpdump on control node and compute node to monitor
package from instance, actually compute node will reply the icmp
package but with destination of instance private ip, since
compute node has no route to that network, it failed and no
package receive on control node nic. but when i add route via
control node, it can reply to insance as expected<br>
then i use tcpdump on control node and instance to monitor
package to the floating ip, instance got nothing but control
node captured the package and reply it instead of instance</p>
<p>so i think the problem may be that the control node will not
modify the source ip when forwad the icmp package, more exactly,
the nat functionality is not enabled?</p>
<p>and i try some other command such as "iptables -t nat -A
POSTROUTING -o eth0 -j MASQUERADE" but it is not working</p>
<p>i'll paste some output if anyone needs<br>
thanks</p>
<br>
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