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    <p><font face="Courier New, Courier, monospace">Problem:</font></p>
    <p><font face="Courier New, Courier, monospace">I have four
        networks, A, B, C, and D<br>
      </font></p>
    <p><font face="Courier New, Courier, monospace">Networks B, C, and D
        should not be able to see each other.</font></p>
    <p><font face="Courier New, Courier, monospace">Network A should be
        able to see all of them.<br>
      </font></p>
    <p><font face="Courier New, Courier, monospace">A - 172.16.1.1/24<br>
        B - 172.16.2.1/24 <br>
        C - 172.16.3.1/24 <br>
        D - 172.16.0.1/24</font></p>
    <p><font face="Courier New, Courier, monospace">For host machine X,
        which is at 172.16.1.100/24 (network A), I added a route for it
        to ping a machine (Y) on the network B:</font></p>
    <p><font face="Courier New, Courier, monospace">    ip route add
        172.16.2.0/24 via 172.16.1.100 dev webservices</font></p>
    <p><font face="Courier New, Courier, monospace">Running tincd on the
        node from the command line (tincd -D -n webservices), and using
        CTRL+C to drop to debug level 5, I can see the ping packet
        getting received from computer X, and being forwarded to
        computer Y.</font></p>
    <p><font face="Courier New, Courier, monospace">However, computer X
        never receives a reply.</font></p>
    <p><font face="Courier New, Courier, monospace">I *think* this is
        because computer Y doesn't know how to route the return packet.
        <br>
      </font></p>
    <p><font face="Courier New, Courier, monospace">Is this correct? Or
        am I missing something else?</font></p>
    <p><font face="Courier New, Courier, monospace">If this is correct,
        how do I tell tinc to route the packet back to computer X?</font><br>
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                      Helvetica, sans-serif;">Michael Munger, dCAP,
                      MCPS, MCNPS, MBSS</td>
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                    <td colspan="2" style="color: #333333; font-size:
                      14px; font-family: Arial, Helvetica, sans-serif;"><strong>Microsoft
                        Certified Professional</strong></td>
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                    <td colspan="2" style="color: #333333; font-size:
                      14px; font-family: Arial, Helvetica, sans-serif;"><strong>Microsoft
                        Certified Small Business Specialist</strong></td>
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                    <td colspan="2" style="color: #333333; font-size:
                      14px; font-family: Arial, Helvetica, sans-serif;"><strong>Digium
                        Certified Asterisk Professional</strong></td>
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                        Powered Help, Inc.</strong></td>
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                      font-size: 14px; font-family: Arial, Helvetica,
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                      Helvetica, sans-serif;" width="20" valign="top">w:</td>
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                      font-size: 14px; font-family: Arial, Helvetica,
                      sans-serif;" valign="top"><a href="https://hph.io"
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                        font-weight: normal; font-size: 14px;">hph.io</a>  <span
                        style="color: #000000;">e: </span><a
                        href="mailto:mj@hph.io" style="color: #1da1db;
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                        font-size: 14px;">mj@hph.io</a></td>
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