[Openstack] can anybody help to explain how the packet of ping shoule be forwarded from vm
Sam Lee
lixq2000 at gmail.com
Tue Sep 23 07:13:55 UTC 2014
I am not sure you are right or not. Bridge is a virtual switch, if we
want to communicate outside world using bridge, we must attach a physical
devices to bridge. eth0 is just the device.
2014-09-23 15:04 GMT+08:00 严超 <yanchao727 at gmail.com>:
> eth0 is virtualized as br100 , as your command show:
>
> 2: eth0: mtu 1500 qdisc pfifo_fast *master br100 state UP* qlen 1000
> link/ether 00:1e:67:6a:8b:c9 brd ff:ff:ff:ff:ff:ff
> inet6 fe80::21e:67ff:fe6a:8bc9/64 scope link
> valid_lft forever preferred_lft forever
>
> So I think packages would be handled by eth0. Right?
>
>
> *Best Regards！*
>
>
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> 2014-09-23 14:33 GMT+08:00 Sam Lee <lixq2000 at gmail.com>:
>
>> I set up an openstack environment using nova-network with multi_host mode.
>>
>> created network info as below,
>>
>> root at ubuntu:~# nova network-show e77b754d-5a89-41fd-8c82-69051e69c4ed
>> +---------------------+--------------------------------------+
>> | Property | Value |
>> +---------------------+--------------------------------------+
>> | bridge | br100 |
>> | vpn_public_port | None |
>> | dhcp_start | 172.16.10.202 |
>> | bridge_interface | eth0 |
>> | updated_at | None |
>> | id | e77b754d-5a89-41fd-8c82-69051e69c4ed |
>> | cidr_v6 | None |
>> | deleted_at | None |
>> | gateway | 172.16.10.1 |
>> | rxtx_base | None |
>> | label | private |
>> | priority | None |
>> | project_id | None |
>> | vpn_private_address | None |
>> | deleted | 0 |
>> | vlan | None |
>> | broadcast | 172.16.10.207 |
>> | netmask | 255.255.255.248 |
>> | injected | False |
>> | cidr | 172.16.10.200/29 |
>> | vpn_public_address | None |
>> | multi_host | True |
>> | dns2 | None |
>> | created_at | 2014-09-11T07:58:13.000000 |
>> | host | None |
>> | gateway_v6 | None |
>> | netmask_v6 | None |
>> | dns1 | 8.8.4.4 |
>> +---------------------+--------------------------------------+
>> Note: 172.16.10.1 is the physical gateway
>>
>> route info of the host as below：
>>
>> Kernel IP routing table
>> Destination Gateway Genmask Flags Metric Ref Use Iface
>> 0.0.0.0 172.16.10.1 0.0.0.0 UG 100 0 0 eth1
>> 10.10.100.0 0.0.0.0 255.255.255.0 U 0 0 0 br100
>> 172.16.10.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
>> 172.16.10.200 0.0.0.0 255.255.255.248 U 0 0 0 br100
>>
>> three instances has been created as below,
>>
>> root at ubuntu:~# nova list
>> +--------------------------------------+-------+--------+-----------------------+
>> | ID | Name | Status | Networks |
>> +--------------------------------------+-------+--------+-----------------------+
>> | 5867fa88-de5c-4656-9811-5c86128b786b | test3 | ACTIVE | private=172.16.10.202 |
>> | 272f8d4f-f924-488b-855f-7f53a2372708 | test4 | ACTIVE | private=172.16.10.204 |
>> | aec01738-996f-42dc-a921-1c859c79ffed | test5 | ACTIVE | private=172.16.10.205 |
>> +--------------------------------------+-------+--------+-----------------------+
>>
>> ip info of host:
>>
>> root at ubuntu:~# ip a
>> 1: lo: mtu 16436 qdisc noqueue state UNKNOWN
>> link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
>> inet 127.0.0.1/8 scope host lo
>> inet 169.254.169.254/32 scope link lo
>> inet6 ::1/128 scope host
>> valid_lft forever preferred_lft forever
>> 2: eth0: mtu 1500 qdisc pfifo_fast master br100 state UP qlen 1000
>> link/ether 00:1e:67:6a:8b:c9 brd ff:ff:ff:ff:ff:ff
>> inet6 fe80::21e:67ff:fe6a:8bc9/64 scope link
>> valid_lft forever preferred_lft forever
>> 3: eth1: mtu 1500 qdisc pfifo_fast state UP qlen 1000
>> link/ether 00:1e:67:6a:8b:c8 brd ff:ff:ff:ff:ff:ff
>> inet 172.16.10.16/24 brd 172.16.10.255 scope global eth1
>> inet6 fe80::21e:67ff:fe6a:8bc8/64 scope link
>> valid_lft forever preferred_lft forever
>> 5: br100: mtu 1500 qdisc noqueue state UP
>> link/ether 00:1e:67:6a:8b:c9 brd ff:ff:ff:ff:ff:ff
>> inet 172.16.10.203/29 brd 172.16.10.207 scope global br100
>> inet 10.10.100.52/24 brd 10.10.100.255 scope global br100
>> inet6 fe80::44c7:b4ff:fe0c:3f/64 scope link
>> valid_lft forever preferred_lft forever
>> 6: vnet0: mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
>> link/ether fe:16:3e:0f:03:49 brd ff:ff:ff:ff:ff:ff
>> inet6 fe80::fc16:3eff:fe0f:349/64 scope link
>> valid_lft forever preferred_lft forever
>> 7: vnet1: mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
>> link/ether fe:16:3e:b3:d8:a1 brd ff:ff:ff:ff:ff:ff
>> inet6 fe80::fc16:3eff:feb3:d8a1/64 scope link
>> valid_lft forever preferred_lft forever
>> 8: vnet2: mtu 1500 qdisc pfifo_fast master br100 state UNKNOWN qlen 500
>> link/ether fe:16:3e:0e:7a:0d brd ff:ff:ff:ff:ff:ff
>> inet6 fe80::fc16:3eff:fe0e:7a0d/64 scope link
>> valid_lft forever preferred_lft forever
>>
>> mac table of br100:
>>
>> root at ubuntu:~# brctl showmacs br100
>> port no mac addr is local? ageing timer
>> 1 00:0c:29:27:9d:7e no 16.79
>> 1 00:0c:29:27:9d:88 no 5.49
>> 1 00:0c:29:58:9a:64 no 31.86
>> 1 00:0c:29:f3:cf:7b no 21.28
>> 1 00:12:7f:7d:37:a1 no 35.54
>> 1 00:14:5e:ac:7c:b5 no 26.20
>> 1 00:14:5e:e8:03:d1 no 13.31
>> 1 00:14:f2:a8:00:81 no 1.11
>> 1 00:1e:67:45:85:ad no 14.02
>> 1 00:1e:67:64:ed:c9 no 10.10
>> 1 00:1e:67:64:ee:a5 no 9.38
>> 1 00:1e:67:6a:8b:c9 yes 0.00
>> 1 00:1e:67:97:17:ee no 52.97
>> 1 52:54:00:01:40:23 no 10.72
>> 1 52:54:00:1c:71:3d no 5.50
>> 1 52:54:00:47:9c:ee no 8.70
>> 1 52:54:00:b8:aa:45 no 9.79
>> 1 52:54:00:ee:60:44 no 7.61
>> 1 5c:f3:fc:00:0e:da no 56.27
>> 1 5c:f3:fc:00:ad:02 no 1.13
>> 1 6c:ae:8b:51:49:12 no 0.64
>> 1 8a:62:65:05:8d:02 no 5.38
>> 1 ae:2a:9d:74:11:03 no 155.47
>> 1 e4:1f:13:75:47:e0 no 8.24
>> 1 e4:1f:13:fc:a8:21 no 176.11
>> 1 fa:16:3e:00:c8:ce no 0.38
>> 1 fa:16:3e:05:61:a3 no 4.29
>> 4 fa:16:3e:0e:7a:0d no 11.35
>> 2 fa:16:3e:0f:03:49 no 9.90
>> 1 fa:16:3e:2c:6c:55 no 24.90
>> 1 fa:16:3e:2d:f0:f0 no 7.40
>> 1 fa:16:3e:3b:35:e1 no 27.88
>> 1 fa:16:3e:3f:1a:0c no 9.18
>> 1 fa:16:3e:49:d6:54 no 10.57
>> 1 fa:16:3e:4a:47:6e no 13.07
>> 1 fa:16:3e:61:d5:0c no 24.14
>> 1 fa:16:3e:6b:89:c1 no 25.96
>> 1 fa:16:3e:85:80:df no 3.74
>> 1 fa:16:3e:8d:a4:da no 28.20
>> 1 fa:16:3e:9f:bb:0c no 13.65
>> 1 fa:16:3e:a6:88:1d no 24.17
>> 3 fa:16:3e:b3:d8:a1 no 6.07
>> 1 fa:16:3e:c8:42:0d no 27.80
>> 1 fa:16:3e:ca:a8:8e no 4.70
>> 1 fa:16:3e:e8:a7:9b no 27.31
>> 4 fe:16:3e:0e:7a:0d yes 0.00
>> 2 fe:16:3e:0f:03:49 yes 0.00
>> 3 fe:16:3e:b3:d8:a1 yes 0.00
>>
>> arp table of instance test5:
>>
>> [root at test5 ~]# arp -a
>> ? (172.16.10.203) at 00:1e:67:6a:8b:c9 [ether] on eth0
>> ? (172.16.10.1) at 00:12:7f:7d:37:a1 [ether] on eth0
>>
>> route info of instance test5
>>
>> [root at test5 ~]# route -n
>> Kernel IP routing table
>> Destination Gateway Genmask Flags Metric Ref Use Iface
>> 172.16.10.1 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
>> 172.16.10.200 0.0.0.0 255.255.255.248 U 1 0 0 eth0
>> 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0
>> 0.0.0.0 172.16.10.1 0.0.0.0 UG 0 0 0 eth0
>>
>> I ping www.sina.com.cn in instances test5(172.16.10.205)
>>
>> [root at test5 ~]# ping www.sina.com.cn
>> PING ara.sina.com.cn (58.63.236.35) 56(84) bytes of data.
>> 64 bytes from 58.63.236.35: icmp_seq=1 ttl=49 time=38.4 ms
>> 64 bytes from 58.63.236.35: icmp_seq=2 ttl=49 time=38.5 ms
>> 64 bytes from 58.63.236.35: icmp_seq=3 ttl=49 time=38.2 ms
>> ^C
>> --- ara.sina.com.cn ping statistics ---
>> 3 packets transmitted, 3 received, 0% packet loss, time 2436ms
>> rtt min/avg/max/mdev = 38.259/38.427/38.536/0.256 ms
>>
>> In my option, the packet will go through as follow,
>> 1. vm eth0
>> 2. br100
>> 3. according the mac table of switch br100， the packet will go through to
>> port 1
>>
>> the next step has always puzzled me
>> 4. the packet arrived at host eth0. Once the packet arrived eth0, it will
>> be processed by iptables chains, INPUT, PREROUTING, kernel routing, OUTPUT
>> and so on. the destination address is 58.63.236.35, based on the kernel
>> routing table, the packet will be processed by eth1. *In fact, eth0
>> processes it.*can anyone explain why??
>>
>>
>>
>>
>>
>> Thanks in advance.
>>
>>
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>>
>
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