__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<!DOCTYPE html>
<html>
<!-- SECTION: Getting Started -->
  <head>
    <title>Firewalls</title>
    <link rel="stylesheet" type="text/css" href="../cups-printable.css">
  </head>
  <body>
    <h1 class="title">Firewalls</h1>

    <p>This help document describes the ports that CUPS uses so that firewall administrators can allow traffic used for printing.</p>

    <h2 class="title" id="SHARING">Ports Used for Printer Sharing</h2>

    <p>Table 1 lists the ports that are used for IPP printer sharing via CUPS.</p>

    <div class="table"><table summary="Ports Used for IPP Printer Sharing">
      <caption>Table 1: Ports Used for IPP Printer Sharing</caption>
      <thead>
        <tr><th>(Destination) Port</th><th>TCP/UDP</th><th>Direction</th><th>Description</th></tr>
      </thead>
      <tbody>
        <tr><td>53&nbsp;(DNS)</td><td>TCP/UDP</td><td>OUT</td><td>Domain Name System lookups and service registrations.</td></tr>
        <tr><td>631&nbsp;(IPP/IPPS)</td><td>TCP</td><td>IN</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)</td></tr>
        <tr><td>5353&nbsp;(mDNS)</td><td>UDP</td><td>IN+OUT</td><td>Multicast DNS lookups and service registrations.</td></tr>
      </tbody>
    </table></div>

    <p>Table 2 lists the ports that are used for SMB (Windows) printer sharing, typically via the Samba software.</p>

    <div class="table"><table summary="Ports Used for SMB Printer Sharing">
      <caption>Table 2: Ports Used for SMB Printer Sharing</caption>
      <thead>
        <tr><th>(Destination) Port(s)</th><th>TCP/UDP</th><th>Direction</th><th>Description</th></tr>
      </thead>
      <tbody>
        <tr><td>137&nbsp;(WINS)</td><td>UDP</td><td>IN+OUT</td><td>Windows Internet Naming Service (name lookup for SMB printing).</td></tr>
        <tr><td>139&nbsp;(SMB)</td><td>TCP</td><td>IN</td><td>Windows SMB printing.</td></tr>
        <tr><td>445&nbsp;(SMBDS)</td><td>TCP</td><td>IN+OUT</td><td>Windows SMB Domain Server (authenticated SMB printing).</td></tr>
      </tbody>
    </table></div>


    <h2 class="title" id="PRINTERS">Ports Used for Network Printers</h2>

    <p>Table 3 lists the ports for outgoing network traffic that are used for network printers.</p>

    <blockquote><b>Notes:</b>
      <ol>
        <li>DNS and mDNS are used for all printing protocols except SMB.</li>
        <li>SNMP is used to provide status and supply level information for AppSocket and LPD printers.</li>
      </ol>
    </blockquote>

    <div class="table"><table summary="Outgoing Ports Used for Network Printers">
      <caption>Table 3: Outgoing Ports Used for Network Printers</caption>
      <thead>
        <tr><th>(Destination) Port(s)</th><th>TCP/UDP</th><th>Description</th></tr>
      </thead>
      <tbody>
        <tr><td>53&nbsp;(DNS)</td><td>TCP/UDP</td><td>Domain Name System lookups.</td></tr>
        <tr><td>137&nbsp;(WINS)</td><td>UDP</td><td>Windows Internet Naming Service (name lookup for SMB printing).</td></tr>
        <tr><td>139&nbsp;(SMB)</td><td>TCP</td><td>Windows SMB printing.</td></tr>
        <tr><td>161&nbsp;(SNMP)</td><td>UDP</td><td>SNMP browsing (broadcast) and status monitoring (directed to printer IP address).</td></tr>
        <tr><td>443&nbsp;(IPPS)</td><td>TCP</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)</td></tr>
        <tr><td>445&nbsp;(SMBDS)</td><td>TCP</td><td>Windows SMB Domain Server (authenticated SMB printing).</td></tr>
        <tr><td>515&nbsp;(LPD)</td><td>TCP</td><td>Line Printer Daemon (LPD/lpr) print job submission and status monitoring.</td></tr>
        <tr><td>631&nbsp;(IPP/IPPS)</td><td>TCP</td><td>Internet Printing Protocol requests and responses (print jobs, status monitoring, etc.)</td></tr>
        <tr><td>5353&nbsp;(mDNS)</td><td>UDP</td><td>Multicast DNS lookups.</td></tr>
        <tr><td>9100-9102</td><td>TCP</td><td>Raw print data stream (AppSocket/JetDirect).</td></tr>
      </tbody>
    </table></div>
  </body>
</html>

Filemanager

DIR : / usr/ share/ cups/ doc-root/ help/
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