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more information, the experiment I did is,&nbsp;</div>
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1) at HostA,</div>
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ping 1.2.3.5 it succeeded.&nbsp; &nbsp;tcpdump -n -e -i ens33 proto gre at hostB could capture the GRE packet.</div>
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at HostB,</div>
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ping 1.2.3.4&nbsp;<span style="font-family: Calibri, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">it succeeded.&nbsp; &nbsp;tcpdump -n -e -i ens33 proto gre at hostA could capture the GRE packet.</span></div>
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While I still want to understand how the GRE packet is encapsulated one Host and then forwarded to the other Host.&nbsp; How the gre1 interface's functionality is called at each host? The two bridges at each host are not connected, how the packets forwarded between
 the two bridges br1 and br2 at each host?</div>
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Thanks much in advance.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>发件人:</b> pei Jikui<br>
<b>发送时间:</b> 2019年1月28日 22:20<br>
<b>收件人:</b> ovs-discuss@openvswitch.org<br>
<b>主题:</b> How does OVS gre packet flow</font>
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hi,&nbsp;</div>
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1) I am experimenting the OVS GRE tunnel with the following configurations with two hosts, HOSTA and HOSTB. The&nbsp; experiment succeeded while I still could not understand how the packet flows between the two hosts.&nbsp;</div>
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There are two bridges created by ovs-vsct at each host (br1 and br2).&nbsp; These two bridges in one Host aren't even connected then how the packets are forwarded between the two bridges in one host and among the two hosts hence? And how the packets are encapsulated
 with the GRE header?</div>
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2) test-bed and configuration</div>
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HostA with ip 10.128.0.155</div>
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HostB with ip 10.128.0.156</div>
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At HostA:</div>
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<span style="font-size:14.0pt"><span style="">a)</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">Create</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">two</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">bridges</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br1</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">and</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br2</span></div>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;
</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">add-</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br1</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp; &nbsp;</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">add-</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br2</span></p>
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<span style="font-size:14.0pt"><span style="">b)</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">Configure</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br1</span></div>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;
</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">add-port</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br1</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">ens33</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;
</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ip</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">addr</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">flush</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">dev</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">ens33</span><span style="font-size:14.0pt; font-family:Calibri; color:black">&nbsp;</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp; ip addr add 10.128.0.155/24 dev br1</span></span></p>
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<span style="font-size:14.0pt"><span style="">c)</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">Configure</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br2</span></div>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;
</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">add-port</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br</span><span style="font-size:14.0pt; font-family:Calibri; color:black">2</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">gre1</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">--</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">set</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">interface</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">gre1</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">type=</span><span style="font-size:14.0pt; font-family:Calibri; color:black">gre</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">options:</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">remote_ip</span><span style="font-size:14.0pt; font-family:Calibri; color:black">=10.128.0.156</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;
</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ip</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">addr</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">add</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">1.2.3.4/24</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">dev</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br2</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black"><span style="">&nbsp;
</span></span><span style="font-size:14.0pt; font-family:Calibri; color:black">ip</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">link</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">set</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">dev</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">br2</span><span style="font-size:14.0pt; font-family:Calibri; color:black">
</span><span style="font-size:14.0pt; font-family:Calibri; color:black">up</span></p>
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</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black">At HostB:</span></p>
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<span style="font-size:14.0pt; font-family:Calibri; color:black">
<div style="margin:0pt 0px 0pt 0.38in; font-size:16px; font-family:Calibri,Helvetica,sans-serif; background-color:rgb(255,255,255); text-indent:-0.38in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt"><span style="margin:0px">a)</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">Create</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">two</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">bridges</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br1</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">and</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br2</span></div>
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<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;<span>&nbsp;</span></span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">add-</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br1</span></p>
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<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp; &nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">add-</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br2</span></p>
<div style="margin:0pt 0px 0pt 0.38in; font-size:16px; font-family:Calibri,Helvetica,sans-serif; background-color:rgb(255,255,255); text-indent:-0.38in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt"><span style="margin:0px">b)</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">Configure</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br1</span></div>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0pt; margin-bottom:0pt; font-family:Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255); margin-left:0in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;<span>&nbsp;</span></span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">add-port</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br1</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ens33</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0pt; margin-bottom:0pt; font-family:Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255); margin-left:0in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;<span>&nbsp;</span></span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ip</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">addr</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">flush</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">dev</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ens33</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">&nbsp;</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0pt; margin-bottom:0pt; font-family:Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255); margin-left:0in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp; ip addr add 10.128.0.156/24 dev br1</span></span></p>
<div style="margin:0pt 0px 0pt 0.38in; font-size:16px; font-family:Calibri,Helvetica,sans-serif; background-color:rgb(255,255,255); text-indent:-0.38in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt"><span style="margin:0px">c)</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">Configure</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br2</span></div>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0pt; margin-bottom:0pt; font-family:Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255); margin-left:0in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;<span>&nbsp;</span></span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ovs-vsctl</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">add-port</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">2</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">gre1</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">--</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">set</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">interface</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">gre1</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">type=</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">gre</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">options:</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">remote_ip</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">=10.128.0.155</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0pt; margin-bottom:0pt; font-family:Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255); margin-left:0in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;<span>&nbsp;</span></span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ip</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">addr</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">add</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">1.2.3.4/24</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">dev</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br2</span></p>
<p style="margin-top: 0px; margin-bottom: 0px;margin-top:0pt; margin-bottom:0pt; font-family:Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255); margin-left:0in; unicode-bidi:embed">
<span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span style="margin:0px">&nbsp;<span>&nbsp;</span></span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">ip</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">link</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">set</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">dev</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">br2</span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black"><span>&nbsp;</span></span><span style="margin:0px; font-size:14pt; font-family:Calibri; color:black">up</span></p>
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<font face="Calibri"><span style="font-size:18.6667px">Thanks</span></font></div>
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<font face="Calibri"><span style="font-size:18.6667px">Jikui</span></font></div>
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