<div dir="ltr"><p style="margin-right:0px;margin-bottom:15px;margin-left:0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px;margin-top:0px!important">I set up an openstack environment using nova-network with multi_host mode.</p><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">created network info as below,</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">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 | <a href="http://172.16.10.200/29">172.16.10.200/29</a> |
| 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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">route info of the host as below：</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">three instances has been created as below,</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">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 |
+--------------------------------------+-------+--------+-----------------------+
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">ip info of host:</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">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 <a href="http://127.0.0.1/8">127.0.0.1/8</a> scope host lo
inet <a href="http://169.254.169.254/32">169.254.169.254/32</a> 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 <a href="http://172.16.10.16/24">172.16.10.16/24</a> 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 <a href="http://172.16.10.203/29">172.16.10.203/29</a> brd 172.16.10.207 scope global br100
inet <a href="http://10.10.100.52/24">10.10.100.52/24</a> 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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">mac table of br100:</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">arp table of instance test5:</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">[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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">route info of instance test5</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">[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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">I ping <a href="http://www.sina.com.cn/" style="margin:0px;padding:0px;border:0px;color:rgb(65,131,196);text-decoration:none">www.sina.com.cn</a> in instances test5(172.16.10.205)</p><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-size:13px;font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-top-left-radius:3px;border-top-right-radius:3px;border-bottom-right-radius:3px;border-bottom-left-radius:3px;color:rgb(51,51,51);background-color:rgb(248,248,248)">[root@test5 ~]# ping <a href="http://www.sina.com.cn">www.sina.com.cn</a>
PING <a href="http://ara.sina.com.cn">ara.sina.com.cn</a> (58.63.236.35) 56(84) bytes of data.
64 bytes from <a href="http://58.63.236.35">58.63.236.35</a>: icmp_seq=1 ttl=49 time=38.4 ms
64 bytes from <a href="http://58.63.236.35">58.63.236.35</a>: icmp_seq=2 ttl=49 time=38.5 ms
64 bytes from <a href="http://58.63.236.35">58.63.236.35</a>: icmp_seq=3 ttl=49 time=38.2 ms
^C
--- <a href="http://ara.sina.com.cn">ara.sina.com.cn</a> 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
</pre><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">In my option, the packet will go through as follow,<br>1. vm eth0<br>2. br100<br>3. according the mac table of switch br100， the packet will go through to port 1</p><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">the next step has always puzzled me<br>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. <strong style="margin:0px;padding:0px;border:0px">In fact, eth0 processes it.</strong>can anyone explain why??</p><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px"><br></p><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px"><img src="cid:ii_i0evcn140_148a137260c934f6" width="472" height="154"><br><br></p><p style="margin:15px 0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">Thanks in advance.</p><p style="margin-top:15px;margin-right:0px;margin-left:0px;padding:0px;border:0px;color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px;margin-bottom:0px!important"><a href="file:///C:/Users/Administrator/AppData/Local/Temp/images.png" target="_blank" style="margin:0px;padding:0px;border:0px;color:rgb(65,131,196);text-decoration:none"></a></p></div>