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[Lei Zhang <zhang.lei.fly@xxxxxxxxx>]

Hi JuanFra,

I read this article. But It doesn't explain what I concern.
What I want to know is that what's the packet flow when ping the floating
ip between the VMs which located in the same physical machine?


On Tue, Apr 9, 2013 at 9:56 PM, JuanFra Rodriguez Cardoso <
juanfra.rodriguez.cardoso@xxxxxxxxx> wrote:

> Could this Mirantis' post help you?
>
> http://www.mirantis.com/blog/vlanmanager-network-flow-analysis/
>
> ---
> JuanFra
>
>
> 2013/4/9 Lei Zhang <zhang.lei.fly@xxxxxxxxx>
>
>>  I am using: Folsom, nova-network, vlanManage, multi_host=ture
>>
>> I want to know what's the package flow between the vms which located in
>> the same physical machine.
>>
>> Here is the typology. I want to know want happen if I ping 192.168.3.47
>> in vm7.
>>
>> When the NAT is applied?
>>
>>    |vm: fixed: 10.0.104.5, floating: 192.168.3.56|-----|vnet15|----|br104|----|vnet14|----| vm7: fixed: 10.0.104.6, floating: 192.168.3.57|
>>
>> if the net.bridge.bridge-nf-call-iptables=0, I can not see the NAT
>> properly.
>>
>> [root@openstack-node1 ~]# tcpdump -i vnet14 -l -ne icmp -v
>> tcpdump: WARNING: vnet14: no IPv4 address assigned
>> tcpdump: listening on vnet14, link-type EN10MB (Ethernet), capture size 65535 bytes
>> 17:11:10.275818 fa:16:3e:3e:ab:8f > fa:16:3e:72:8f:b4, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
>>     10.0.104.6 > 192.168.3.56: ICMP echo request, id 31090, seq 1, length 64
>> 17:11:10.277546 fa:16:3e:22:31:09 > fa:16:3e:3e:ab:8f, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 64703, offset 0, flags [none], proto ICMP (1), length 84)
>>     10.0.104.5 > 10.0.104.6: ICMP echo reply, id 31090, seq 1, length 64
>>
>> When net.bridge.bridge-nf-call-iptables=1, I found the NAT properly. But
>> I also found it is said the bridge filter should be disabled in
>> http://docs.openstack.org/trunk/openstack-compute/admin/content/network-troubleshooting.html.
>> Is this true?
>>
>>
>> [root@openstack-node1 ~]# tcpdump -i vnet14 -l -ne icmp -v
>> tcpdump: WARNING: vnet14: no IPv4 address assigned
>> tcpdump: listening on vnet14, link-type EN10MB (Ethernet), capture size 65535 bytes
>> 17:13:40.507577 fa:16:3e:3e:ab:8f > fa:16:3e:72:8f:b4, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
>>     10.0.104.6 > 192.168.3.56: ICMP echo request, id 42098, seq 1, length 64
>> 17:13:40.508034 fa:16:3e:22:31:09 > fa:16:3e:3e:ab:8f, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 64704, offset 0, flags [none], proto ICMP (1), length 84)
>>     192.168.3.56 > 10.0.104.6: ICMP echo reply, id 42098, seq 1, length 64
>>
>> --
>> Lei Zhang
>>
>> Blog: http://jeffrey4l.github.com
>> twitter/weibo: @jeffrey4l
>>
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>>
>


-- 
Lei Zhang

Blog: http://jeffrey4l.github.com
twitter/weibo: @jeffrey4l