openstack team mailing list archive

[JuanFra Rodriguez Cardoso <juanfra.rodriguez.cardoso@xxxxxxxxx>]

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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