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---------- Forwarded message ----------
From: lzy.dev at gmail.com <lzy.dev at gmail.com>
Date: Tue, Apr 9, 2013 at 5:24 PM
Subject: Re: [Openstack] What's the package flow in vlan mode when
ping the floating ip between vms.
To: Lei Zhang <zhang.lei.fly at gmail.com>


Please take look on this:
http://www.mirantis.com/blog/vlanmanager-network-flow-analysis/

On Tue, Apr 9, 2013 at 5:17 PM, Lei Zhang <zhang.lei.fly at gmail.com> wrote:
> 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 at 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 at 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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