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Hi Jiaan,

You may need to change your db, to set nova.network's 'multi_host' to 1 as
well.

Hope it helps.

*Best Regards,
Xiaolin Zhang*



On Fri, Jul 20, 2012 at 5:54 PM, Xiaolin Zhang <zhangxiaolins at gmail.com>wrote:

> Hi Jiaan,
>
> The problem may relates to SNAT iptables set by nova-network. Based on the
> description, I guess you have only one nova-network running on Controller.
>
> Please try:
>
> 1. add the following line to /etc/nova/nova.conf
> --mutil_host=true
>
> 2. start a nova-network instance on Compute Node
> service nova-network start
>
> 3. reboot your instance, to enforce network filters on Controller
> nova reboot $id
>
> try to access your vm instance.
>
>
> *Best Regards,
> Xiaolin Zhang*
>
>
>
> On Sat, Jul 14, 2012 at 10:58 AM, Jiaan Zeng <l.allen09 at gmail.com> wrote:
>
>> Hi List,
>>
>> I have a network problem while setting up essex.  The instances on
>> control node can access internet, while instances on compute node cannot. I
>> tcpdump the ping traffic and found something weird. VM on compute node can
>> send ICMP request out and the src ip of the ICMP package is changed to ip
>> of control node. Destination can receive the request and reply back to
>> control node. But VM on compute node gets nothing back. I can ping control
>> node from VM on compute node though. Based on that, I think there should be
>> something wrong with the gateway set up by nova-network. But I don't know
>> how to do further debug.
>>
>> Any suggestions would be greatly appreciated!
>>
>> I set up on two machines. Each has only *one* NIC. I use FlatDHCPManager
>> and place the bridge on the public NIC. Below is my configuration file of
>> network part.
>>
>> --network_manager=nova.network.manager.FlatDHCPManager
>> --public_interface=eth0
>> --flat_interface=eth0
>> --flat_network_bridge=br100
>> --fixed_range=192.168.22.32/27
>> --floating_range=10.42.0.32/27
>> --network_size=32
>> --flat_network_dhcp_start=192.168.22.33
>> --flat_injected=False
>> --force_dhcp_release=True
>>
>> --
>> Regards,
>> Jiaan
>>
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>
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