<div dir="ltr"><span style="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">www.sina.com.cn</a>, so </span><span style="color:rgb(51,51,51);font-family:Helvetica,arial,freesans,clean,sans-serif;font-size:14px;line-height:22.3999996185303px">the destination address is 58.63.236.35. the following route should be used .</span><div><pre style="white-space:pre-wrap;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)">0.0.0.0 172.16.10.1 0.0.0.0 UG 100 0 0 eth1</pre></div></div><div class="gmail_extra"><br><div class="gmail_quote">2014-09-23 15:56 GMT+08:00 严超 <span dir="ltr"><<a href="mailto:yanchao727@gmail.com" target="_blank">yanchao727@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font size="4">Seems like the package show go to this route:<br></font><span class=""><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-radius:3px 3px 3px 3px;color:rgb(51,51,51);background-color:rgb(248,248,248)"><font size="4">172.16.10.200 0.0.0.0 255.255.255.248 U 0 0 0 br100</font></pre></span><font size="4">Which is br100 presents eth0. </font><br><div><div><br></div></div></div><div class="gmail_extra"><span class=""><br clear="all"><div><div dir="ltr"><div><font face="comic sans ms, sans-serif" size="4"><b><i>Best Regards！</i></b></font></div><font face="comic sans ms, sans-serif" size="4"><b><i>Chao Yan<br><font>--------------<br></font></i></b></font><font face="comic sans ms, sans-serif" size="4"><b><i><font>My twitter：Andy Yan <a href="https://twitter.com/yanchao727" target="_blank">@yanchao727</a></font></i></b></font><br><font face="comic sans ms, sans-serif" size="4"><b><i><font>My Weibo：<a href="http://weibo.com/herewearenow" target="_blank">http://weibo.com/herewearenow</a><br>--------------</font><br></i></b></font></div></div>
<br></span><div><div class="h5"><div class="gmail_quote">2014-09-23 15:51 GMT+08:00 Sam Lee <span dir="ltr"><<a href="mailto:lixq2000@gmail.com" target="_blank">lixq2000@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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</div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2014-09-23 15:47 GMT+08:00 Sam Lee <span dir="ltr"><<a href="mailto:lixq2000@gmail.com" target="_blank">lixq2000@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Can you explain it more detail? when the routing table is used? </div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2014-09-23 15:39 GMT+08:00 严超 <span dir="ltr"><<a href="mailto:yanchao727@gmail.com" target="_blank">yanchao727@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font size="4">I think that path should depends on your route table. You can modify route table to take some tests.</font><br></div><div class="gmail_extra"><span><br clear="all"><div><div dir="ltr"><div><font face="comic sans ms, sans-serif" size="4"><b><i>Best Regards！</i></b></font></div><font face="comic sans ms, sans-serif" size="4"><b><i>Chao Yan<br><font>--------------<br></font></i></b></font><font face="comic sans ms, sans-serif" size="4"><b><i><font>My twitter：Andy Yan <a href="https://twitter.com/yanchao727" target="_blank">@yanchao727</a></font></i></b></font><br><font face="comic sans ms, sans-serif" size="4"><b><i><font>My Weibo：<a href="http://weibo.com/herewearenow" target="_blank">http://weibo.com/herewearenow</a><br>--------------</font><br></i></b></font></div></div>
<br></span><div><div><div class="gmail_quote">2014-09-23 15:21 GMT+08:00 Sam Lee <span dir="ltr"><<a href="mailto:lixq2000@gmail.com" target="_blank">lixq2000@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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. </div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2014-09-23 15:18 GMT+08:00 严超 <span dir="ltr"><<a href="mailto:yanchao727@gmail.com" target="_blank">yanchao727@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font size="4">Yes, that's what I suggest. You can use tcpdump to track packages as well.</font><br></div><div class="gmail_extra"><span><br clear="all"><div><div dir="ltr"><div><font face="comic sans ms, sans-serif" size="4"><b><i>Best Regards！</i></b></font></div><font face="comic sans ms, sans-serif" size="4"><b><i>Chao Yan<br><font>--------------<br></font></i></b></font><font face="comic sans ms, sans-serif" size="4"><b><i><font>My twitter：Andy Yan <a href="https://twitter.com/yanchao727" target="_blank">@yanchao727</a></font></i></b></font><br><font face="comic sans ms, sans-serif" size="4"><b><i><font>My Weibo：<a href="http://weibo.com/herewearenow" target="_blank">http://weibo.com/herewearenow</a><br>--------------</font><br></i></b></font></div></div>
<br></span><div><div><div class="gmail_quote">2014-09-23 15:13 GMT+08:00 Sam Lee <span dir="ltr"><<a href="mailto:lixq2000@gmail.com" target="_blank">lixq2000@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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. </div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2014-09-23 15:04 GMT+08:00 严超 <span dir="ltr"><<a href="mailto:yanchao727@gmail.com" target="_blank">yanchao727@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font size="4">eth0 is virtualized as br100 , as your command show:<br></font><span><pre style="margin-top:15px;margin-bottom:15px;padding:6px 10px;border:1px solid rgb(204,204,204);font-family:Consolas,'Liberation Mono',Courier,monospace;line-height:19px;overflow:auto;border-radius:3px 3px 3px 3px;color:rgb(51,51,51);background-color:rgb(248,248,248)"><font size="4">2: eth0: mtu 1500 qdisc pfifo_fast <b>master br100 state UP</b> 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</font></pre></span><font size="4">So I think packages would be handled by eth0. Right?</font><br><div><div><br></div></div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><font face="comic sans ms, sans-serif" size="4"><b><i>Best Regards！</i></b></font></div><font face="comic sans ms, sans-serif" size="4"><b><i>Chao Yan<br><font>--------------<br></font></i></b></font><font face="comic sans ms, sans-serif" size="4"><b><i><font>My twitter：Andy Yan <a href="https://twitter.com/yanchao727" target="_blank">@yanchao727</a></font></i></b></font><br><font face="comic sans ms, sans-serif" size="4"><b><i><font>My Weibo：<a href="http://weibo.com/herewearenow" target="_blank">http://weibo.com/herewearenow</a><br>--------------</font><br></i></b></font></div></div>
<br><div class="gmail_quote"><div><div>2014-09-23 14:33 GMT+08:00 Sam Lee <span dir="ltr"><<a href="mailto:lixq2000@gmail.com" target="_blank">lixq2000@gmail.com</a>></span>:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><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" target="_blank">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" target="_blank">127.0.0.1/8</a> scope host lo
inet <a href="http://169.254.169.254/32" target="_blank">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" target="_blank">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" target="_blank">172.16.10.203/29</a> brd 172.16.10.207 scope global br100
inet <a href="http://10.10.100.52/24" target="_blank">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" target="_blank">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" target="_blank">www.sina.com.cn</a>
PING <a href="http://ara.sina.com.cn" target="_blank">ara.sina.com.cn</a> (58.63.236.35) 56(84) bytes of data.
64 bytes from <a href="http://58.63.236.35" target="_blank">58.63.236.35</a>: icmp_seq=1 ttl=49 time=38.4 ms
64 bytes from <a href="http://58.63.236.35" target="_blank">58.63.236.35</a>: icmp_seq=2 ttl=49 time=38.5 ms
64 bytes from <a href="http://58.63.236.35" target="_blank">58.63.236.35</a>: icmp_seq=3 ttl=49 time=38.2 ms
^C
--- <a href="http://ara.sina.com.cn" target="_blank">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" height="154" width="472"><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 style="margin:0px;padding:0px;border:0px;color:rgb(65,131,196);text-decoration:none"></a></p></div>
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