<html>
    <head>
      <base href="https://bugzilla.netfilter.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - REDIRECT tftp doesn't work with docker"
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1346">1346</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>REDIRECT tftp doesn't work with docker
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>netfilter/iptables
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86_64
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Ubuntu
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P5
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>nf_conntrack
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>netfilter-buglog@lists.netfilter.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>maxim.kaskevich@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>REDIRECT target for tftp traffic doesn't work with tftp server launched inside
docker container. Not sure it's iptables bug but same thing for http/https
works fine. 

How to reproduce
On host machine:

# modprobe nf_conntrack_tftp
# sudo iptables -t nat -A PREROUTING -m mac --mac-source <REMOTE DEVICE MAC> -p
udp --dport 69 -j REDIRECT --to-port 6969
# echo TEST > /var/tftpboot/hello.txt
# docker run -p 6969:69/udp -v /var/tftpboot:/var/tftpboot pghalliday/tftp

On device with <REMOTE DEVICE MAC>:

# tftp  -g -r hello.txt <my ip>

Expect: file is downloaded
Actual results: "tftp: timeout"


System:
4.15.0-52-generic #56-Ubuntu SMP Tue Jun 4 22:49:08 UTC 2019 x86_64

Additional info:
- "conntrack -L" shows that packets from remote device are "[UNREPLIED]" 
- "tftp  -g -r hello.txt <my ip> 6969" works fine
- I checked on the same enviroment: if instead docker, run regular tftp (I used
tftpd-hpa) and configure it to port 6969, tftp command on remote device works
fine.</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are watching all bug changes.</li>
      </ul>
    </body>
</html>