I think routing is in step 4。 The packet shoule be processed by eth1 based on routing table. in fact eth0 process it. this is what I am puzzled
2014-09-23 15:47 GMT+08:00 Sam Lee <[email protected]>: > Can you explain it more detail? when the routing table is used? > > 2014-09-23 15:39 GMT+08:00 严超 <[email protected]>: > >> I think that path should depends on your route table. You can modify >> route table to take some tests. >> >> *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 15:21 GMT+08:00 Sam Lee <[email protected]>: >> >>> 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 <[email protected]>: >>> >>>> 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 <[email protected]>: >>>> >>>>> 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 <[email protected]>: >>>>> >>>>>> 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 <[email protected]>: >>>>>> >>>>>>> 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 : [email protected] >>>>>>> Unsubscribe : >>>>>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >>> >> >
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