I have tracked the packets using tcpdump, and it shows that the eth0 process the packets. When a floating ip is added on instance, eth1 process the packets.
2014-09-23 15:18 GMT+08:00 严超 <yanchao...@gmail.com>: > Yes, that's what I suggest. You can use tcpdump to track packages as well. > > *Best Regards！* > > > *Chao Yan--------------**My twitter：Andy Yan @yanchao727 > <https://twitter.com/yanchao727>* > > > *My Weibo：http://weibo.com/herewearenow > <http://weibo.com/herewearenow>--------------* > > 2014-09-23 15:13 GMT+08:00 Sam Lee <lixq2...@gmail.com>: > >> 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 <yanchao...@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！* >>> >>> >>> *Chao Yan--------------**My twitter：Andy Yan @yanchao727 >>> <https://twitter.com/yanchao727>* >>> >>> >>> *My Weibo：http://weibo.com/herewearenow >>> <http://weibo.com/herewearenow>--------------* >>> >>> 2014-09-23 14:33 GMT+08:00 Sam Lee <lixq2...@gmail.com>: >>> >>>> I set up an openstack environment using nova-network with multi_host >>>> mode. >>>> >>>> created network info as below, >>>> >>>> root@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@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@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@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@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@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@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. >>>> >>>> >>>> _______________________________________________ >>>> Mailing list: >>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >>>> Post to : openstack@lists.openstack.org >>>> Unsubscribe : >>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >>>> >>>> >>> >> >
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